GitHub Actions Test Pull Request + Documentation Fixes

[Hundrec]

The latest Pull Request was actually labeled by GitHub Actions, so this PR tests it again.

I actually noticed a few things that needed changing, so I've made valid changes that Eric should take a look at:

• Noted an unfinished sentence in the Build Flags section of COMPILING.md (fixes Compilation guide: "Great for fast iteration, but the game-" #3478)
• Renamed troubleshooting.md to TROUBLESHOOTING.md to fix a broken link in the Compiling Guide
• Miscellaneous grammatical fixes

[AbnormalPoof]

I wonder why there's a separate label for documentation instead of just using the type: documentation label.

Maybe to separate PRs that edit the source code and PRs that edit the .md files? I'm not really sure.

[Hundrec]

Good point!
I was going to change the label until I saw your edit
I'll just let Eric handle the best way to label things.

[Hundrec]

Just realized that the size labels take the sum of additions and deletions.
5 line changes = 10 changes = medium
Noting this here so Eric can decide what a small/medium PR really is.

[LukerUpgradez]

I noticed the all-caps issue with the troubleshooting link a couple days ago but never got around to trying to fix it. Thanks for taking care of that!

[EliteMasterEric]

Maybe to separate PRs that edit the source code and PRs that edit the .md files? I'm not really sure.

documentation labels those PRs that edit .md files and haxe labels those PRs that edit .hx files. I think this is fine as is because some pull request modify both.