SignedXml: drop .NET 12 InvalidOperationException documentation (#13054)

The dotnet/runtime PR that would have thrown InvalidOperationException on SignedXml instance reuse in .NET 12 (dotnet/runtime#132836) has been closed and is not going to ship. Remove the 10 <exception cref="T:System.InvalidOperationException"> entries added across ComputeSignature, CheckSignature, CheckSignatureReturningKey, LoadXml, AddReference, and AddObject, and drop the .NET 12-specific sentence from the `Instances are single-use` remarks section. The general guidance that a SignedXml instance is not intended to be reused across multiple signing or verification operations remains correct and stays.

Author: krwq

xml/System.Security.Cryptography.Xml/SignedXml.xml

@@ -190,7 +190,7 @@ Given the risks of external references, <xref:System.Security.Cryptography.Xml.S
 
 ## Instances are single-use
 
-A <xref:System.Security.Cryptography.Xml.SignedXml> instance is not intended to be reused across multiple signing or verification operations. Starting in .NET 12, calling <xref:System.Security.Cryptography.Xml.SignedXml.ComputeSignature*> or <xref:System.Security.Cryptography.Xml.SignedXml.CheckSignature*> more than once on the same instance, or calling <xref:System.Security.Cryptography.Xml.SignedXml.LoadXml*>, <xref:System.Security.Cryptography.Xml.SignedXml.AddReference*>, or <xref:System.Security.Cryptography.Xml.SignedXml.AddObject*> after a call to <xref:System.Security.Cryptography.Xml.SignedXml.ComputeSignature*> or <xref:System.Security.Cryptography.Xml.SignedXml.CheckSignature*> has begun on the same instance, throws <xref:System.InvalidOperationException>. This applies even if the earlier call itself threw an exception. Create a new <xref:System.Security.Cryptography.Xml.SignedXml> instance for each signing or verification operation.
+A <xref:System.Security.Cryptography.Xml.SignedXml> instance is not intended to be reused across multiple signing or verification operations. Reusing an instance can produce incorrect results. Create a new <xref:System.Security.Cryptography.Xml.SignedXml> instance for each signing or verification operation.
 
  ]]></format>
     </remarks>
@@ -447,7 +447,6 @@ The following code example shows how to sign and verify a single element of an X
 
  ]]></format>
         </remarks>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="AddReference">
@@ -515,7 +514,6 @@ The following code example shows how to sign and verify a single element of an X
 
  ]]></format>
         </remarks>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <MemberGroup MemberName="CheckSignature">
@@ -608,7 +606,6 @@ The following code example shows how to sign and verify a single element of an X
  -or
 
  The hash algorithm could not be created.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="CheckSignature">
@@ -674,7 +671,6 @@ The following code example shows how to sign and verify a single element of an X
  -or
 
  The hash algorithm could not be created.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="CheckSignature">
@@ -740,7 +736,6 @@ The following code example shows how to sign and verify a single element of an X
  -or-
 
  The cryptographic transform used to check the signature could not be created.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="CheckSignature">
@@ -803,7 +798,6 @@ The X.509 certificate is verified. The <xref:System.Security.Cryptography.Xml.Si
         </remarks>
         <exception cref="T:System.ArgumentNullException">The <paramref name="certificate" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.Security.Cryptography.CryptographicException">A signature description could not be created for the <paramref name="certificate" /> parameter.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="CheckSignatureReturningKey">
@@ -877,7 +871,6 @@ The X.509 certificate is verified. The <xref:System.Security.Cryptography.Xml.Si
  -or
 
  The hash algorithm could not be created.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <MemberGroup MemberName="ComputeSignature">
@@ -955,7 +948,6 @@ The X.509 certificate is verified. The <xref:System.Security.Cryptography.Xml.Si
  -or-
 
  The key could not be loaded.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="ComputeSignature">
@@ -1026,7 +1018,6 @@ The X.509 certificate is verified. The <xref:System.Security.Cryptography.Xml.Si
  -or-
 
  The cryptographic transform used to check the signature could not be created.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="EncryptedXml">
@@ -1331,7 +1322,6 @@ The X.509 certificate is verified. The <xref:System.Security.Cryptography.Xml.Si
  -or-
 
  The <paramref name="value" /> parameter does not contain a valid <see cref="P:System.Security.Cryptography.Xml.SignedXml.SignedInfo" /> property.</exception>
-        <exception cref="T:System.InvalidOperationException">The <see cref="T:System.Security.Cryptography.Xml.SignedXml" /> instance has already been used to compute or verify a signature.</exception>
       </Docs>
     </Member>
     <Member MemberName="m_signature">
@@ -3060,4 +3050,3 @@ The X.509 certificate is verified. The <xref:System.Security.Cryptography.Xml.Si
     </Member>
   </Members>
 </Type>
-