c# region support for code snippets broken by #endregion with extra text

[tobiasbunyan]

Title

The regex for detecting #endregion in c# code snippet support expects to only have whitespace to the end of the line after #endregion. If there is extra text the #endregion is not detected, resulting in an error.

Functional impact

Documentation build fails.

Minimal repro steps

1. Create a class with text after the endregion:

#region TestRegion
public class someclass
{
}
#endregion TestRegion

2. Reference this file in a conceptual document using a code snippet markdown:

[!code-csharp[Main](someclass.cs?name=TestRegion)]

3. Build the documentation

Expected result

The code snippet is generated as normal.

Actual result

Error occurs and build fails.

Document.CompilePhaseHandler.ConceptualDocumentProcessor.Build.BuildConceptualDocument](articles/intro.md)Tag name TestRegion is not found Web.Documentation C:\Users\tbunyan\Source\Workspaces\Web.Documentation\EXEC

Further technical details

Whilst adding text after an #endregion has no effect, it is not actually prohibited, and so should be allowed for.

Changing the CSharpCodeSnippetCommentEndLineRegex value in Microsoft.DocAsCode.Dfm.TagNameBlockPathQueryOption should alleviate this.

Untested suggestion:
From

@"^\s*#\s*endregion\s*$"

To

@"^\s*#\s*endregion\s?.*$"

[vwxyzh]

@tobiasbunyan This bug should be fixed in current release version.