fix: v1.5 edits

[scissorsneedfoodtoo]

Checklist:

• [x] I have read freeCodeCamp's contribution guidelines.
• [x] My pull request has a descriptive title (not a vague title like Update index.md)

This PR contains the first editing pass of the new content that was added recently.

I also tried to standardize the spelling for the following words / terms:

• whelp --> welp (This was my mistake in my last PR. Did more research and "welp" is correct.)
• woah --> whoa (The word "whoa" is considered more standard in American English, though "woah" is becoming more common)
• standup --> stand-up (Both are fine, though stand-up seems to be much more common)

Edit: Just did some test builds for PC, Mac, and Android, and all of those succeed. This should be ready for review.