add "Other Tips" notes to TESTGUIDE.md and a script to update baseline files under test/fsharp#5117

Merged

dsyme merged 2 commits intodotnet:masterfrom

smoothdeveloper:testguide-and-fsharptestsuite-updatescript

Jun 6, 2018

Commits on Jun 6, 2018

* helper script to update baseline files under tests/fsharp
smoothdeveloper
committed
add the script to the project where it is most likely to be useful
smoothdeveloper
committed