[docs] Annotate mailing lists with their "name".

[docs] Annotate mailing lists with their "name".

Nobody says "the developer's list" or "commits archive"; they always say
"llvmdev" or "llvm-commits". It makes sense for our documentation to
at least make that association explicitly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178425 91177308-0d34-0410-b5e6-96231b3b80d8