docs: add errors for old and new assertions

Author: Meir017

.github/workflows/integration.yml

@@ -18,10 +18,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Setup .NET 6
+      - name: Setup .NET 8
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - run: dotnet test src/FluentAssertions.Analyzers.FluentAssertionAnalyzerDocs # before formatting
       - name: Run the docs generator
         shell: pwsh

src/FluentAssertions.Analyzers.FluentAssertionAnalyzerDocs/FluentAssertions.Analyzers.FluentAssertionAnalyzerDocs.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
     <IsTestProject>true</IsTestProject>

src/FluentAssertions.Analyzers.FluentAssertionAnalyzerDocsGenerator/FluentAssertions.Analyzers.FluentAssertionAnalyzerDocsGenerator.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <LangVersion>preview</LangVersion>
   </PropertyGroup>