Fix Arcade auto-update normalization; explain `MICROSOFT_UPSTREAM`#129

Merged

dagood merged 2 commits intomicrosoft:microsoft/mainfrom

dagood:arcade-update-norm

Jul 16, 2021

Commits on Jul 13, 2021

Fix auto-update thrash: change root .gitattributes
dagood
committed

Commits on Jul 15, 2021

Merge branch 'microsoft/main' into arcade-update-norm
dagood
authored