[docs] Amend the release notes with more things I've contributed since the last release

  linked in a different order than with GNU ld, inserting a DWARF exception

  table terminator too early.)

* lld now supports COFF embedded directives for linking to nondefault

  libraries, just like for the normal COFF target.

* Actually generate a codeview build id signature, even if not creating a PDB.

  Previously, the ``--build-id`` option did not actually generate a build id

  unless ``--pdb`` was specified.

MachO Improvements

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