Review and update Labels-used-for-issues.md

[Youssef1313]

https://github.com/dotnet/roslyn/blob/master/docs/wiki/Labels-used-for-issues.md

• Under Urgency, you also have an Urgency-Low label.
• Labels under Verification post-resolution seem to be no longer used.
• Labels under Area are missing Area-Performance label.
• CLA labels seem to be no longer used.
• Grabbed by community is now just "Community".
• The New language features section should point the readers to dotnet/csharplang
• Up For Grabs is now "help wanted".

[AdamSpeight2008]

What is it the procedure for external users, that can't add labels?

1. Continue with prefixed the title of the issues / request.
2. Add a section to the text of the post eg.

   Labels: [Community] [Visual Basic] [Bug]
   Summary:
   Such and such not working as expected, in version blah.
   Details:
   ....

[Youssef1313]

What is it the procedure for external users, that can't add labels?

@AdamSpeight2008, I think none. The issue labeler bot adds the Area- labels, and other labels are added when issues are reviewed manually.

[jcouv]

Tagging @jmarolf since it looks like he authored the https://github.com/dotnet/roslyn/blob/master/docs/wiki/Labels-used-for-issues.md document

[jmarolf]

@Youssef1313 I think you recommendations for that page are good. Consider this an approval to update it if you have the time.