chore/cleanups

[busticated]

Description

Adds cargo xtask spellcheck task to find spelling mistakes in source code and docs across the workspace. Cleans up some typos and tunes interfaces and task output.

How to Test

1. Clone and setup this branch locally (docs)
2. Review the "How to check for spelling errors" How-To item
3. Review available tasks: cargo xtask --help
4. Add a typo to a source file and save (see note here and dictionary)
5. Check for typos: cargo xtask spellcheck
6. Undo your source file edit: git checkout -- <path-to-file>

Outcome

How-to entry should be clear and helpful, cargo xtask spellcheck task should flag "known" typos, code refactors should make sense.

Related / Discussions

#5

Completeness

• PR opened 🎉
• Testing instructions have been provided
• Development How-To's have been provided
• Docs have been updated (cargo xtask doc)
• Branch is rebased against target (typically main)

[busticated]