Document -LoginHint parameter in Connect-MgGraph help

Add the missing -LoginHint parameter block to the Connect-MgGraph markdown
docs and generated MAML help (syntax + parameter list), which the earlier
docs regeneration omitted because the module DLL predated the new parameter.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 04338979-a6b1-4abe-9ffe-42eb16b07442

Author: gavinbarron

src/Authentication/Authentication/Microsoft.Graph.Authentication.dll-Help.xml

@@ -484,6 +484,18 @@ Canary    https://login.microsoftonline.com   https://microsoftgraph.com User-de
           </dev:type>
           <dev:defaultValue>None</dev:defaultValue>
         </command:parameter>
+        <command:parameter required="false" variableLength="true" globbing="false" pipelineInput="False" position="named" aliases="none">
+          <maml:name>LoginHint</maml:name>
+          <maml:description>
+            <maml:para>The login hint (typically a username or email) used to pre-populate the account field during interactive browser authentication.</maml:para>
+          </maml:description>
+          <command:parameterValue required="true" variableLength="false">String</command:parameterValue>
+          <dev:type>
+            <maml:name>String</maml:name>
+            <maml:uri />
+          </dev:type>
+          <dev:defaultValue>None</dev:defaultValue>
+        </command:parameter>
         <command:parameter required="false" variableLength="true" globbing="false" pipelineInput="False" position="named" aliases="none">
           <maml:name>NoWelcome</maml:name>
           <maml:description>
@@ -921,6 +933,18 @@ Canary    https://login.microsoftonline.com   https://microsoftgraph.com User-de
         </dev:type>
         <dev:defaultValue>False</dev:defaultValue>
       </command:parameter>
+      <command:parameter required="false" variableLength="true" globbing="false" pipelineInput="False" position="named" aliases="none">
+        <maml:name>LoginHint</maml:name>
+        <maml:description>
+          <maml:para>The login hint (typically a username or email) used to pre-populate the account field during interactive browser authentication.</maml:para>
+        </maml:description>
+        <command:parameterValue required="true" variableLength="false">String</command:parameterValue>
+        <dev:type>
+          <maml:name>String</maml:name>
+          <maml:uri />
+        </dev:type>
+        <dev:defaultValue>None</dev:defaultValue>
+      </command:parameter>
       <command:parameter required="false" variableLength="true" globbing="false" pipelineInput="False" position="named" aliases="none">
         <maml:name>NoWelcome</maml:name>
         <maml:description>

src/Authentication/docs/Connect-MgGraph.md

@@ -15,8 +15,8 @@ Microsoft Graph PowerShell supports two types of authentication: delegated and a
 ### UserParameterSet (Default)
 ```
 Connect-MgGraph [[-Scopes] <String[]>] [[-ClientId] <String>] [-TenantId <String>]
- [-ContextScope <ContextScope>] [-Environment <String>] [-UseDeviceCode] [-ClientTimeout <Double>] [-NoWelcome]
- [-ProgressAction <ActionPreference>] [<CommonParameters>]
+ [-ContextScope <ContextScope>] [-Environment <String>] [-UseDeviceCode] [-LoginHint <String>]
+ [-ClientTimeout <Double>] [-NoWelcome] [-ProgressAction <ActionPreference>] [<CommonParameters>]
 ```
 
 ### AppCertificateParameterSet
@@ -364,6 +364,21 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -LoginHint
+The login hint (typically a username or email) used to pre-populate the account field during interactive browser authentication.
+
+```yaml
+Type: String
+Parameter Sets: UserParameterSet
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### -NoWelcome
 Hides the welcome message.