Address more issue numbers in the code (#1888)

Address more issue numbers in the code (#1888)

* Address more issue numbers in the code

Replaced a bunch of unadorned issue numbers with links, so we know which repo the issue is for.  In some cases the repo was named, but for consistency I still replaced it with a link.

In some cases, in particular where the issue had been closed saying effectively "we're not going to do anything here", I removed TODOs and the associated issue numbers.

In a few cases, the TODO and issue number was to say "we should do X when Y is fixed", so I did X since Y was fixed.

* Apply suggestions from code review

Co-Authored-By: Jan Kotas <jkotas@microsoft.com>
* Address PR feedback

* Fix OrderedEnumerable by using MemoryExtensions.Sort

Co-authored-by: Jan Kotas <jkotas@microsoft.com>