Draft: clean out some typos

I was testing my own tooling which has significant overlap to cspell (including the ability to suggest/use its dictionaries).

I've written some patterns that help me ignore content: https://github.com/check-spelling/drupal/blob/d1d4b216cfa55d593987b4f143ab6313508a2eef/.github/actions/spelling/patterns.txt And selected patterns for ignoring files entirely: https://github.com/check-spelling/drupal/blob/d1d4b216cfa55d593987b4f143ab6313508a2eef/.github/actions/spelling/excludes.txt

I'm happy to drop any/all of the changes, or to split anything into distinct issues. The Drupal advice said to search for an existing issue before filing one, and this issue is definitely related -- my starting point was indeed looking at the cspell dictionary file and identifying things that weren't really words.

The drupal guidelines say to prefer en-US, so in a few rare cases, I did switch things (mostly because they were already really in the minority in the codebase).

I have some extra rules against specific additional patterns (e.g. non-existent or non existent or not existent), but if the project doesn't want those changes, I'm happy to drop them as well: https://github.com/check-spelling/drupal/blob/d1d4b216cfa55d593987b4f143ab6313508a2eef/.github/actions/spelling/line_forbidden.patterns

For perspective, to the main ticket, the current dictionary has 1679 entries, whereas I've promoted ~1200 of them into the dictionary I'm using and have a bunch of items I don't think are words with ~1200 entries.

Note that I started my work on 10.1.x and this is a backport, which means that it's possible a bunch of items I've added to the dictionary aren't present, but I treat my dictionary as "words that are words whether or not they're currently used" whereas "expect" is "tokens that were seen but not found in the dictionary").