Update OpenXmlPowerTools.csproj

linked Microsoft.CodeAnalysis.FxCopAnalyzers issue

Author: stesee

OpenXmlPowerTools/OpenXmlPowerTools.csproj

@@ -43,7 +43,7 @@ It supports scenarios such as:
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <!--Causes a hanging build-->
+    <!--Causes a hanging build see https://github.com/dotnet/roslyn-analyzers/issues/2790 for details-->
     <!--<PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>