chore: unneeded comments, typos in comments

[hippietrail]

Issues

N/A

Description

While working on other things I noticed Harper was flagging some things in comments in its own source.
Some comments were not intended to remain in the code and others contained typos.

How Has This Been Tested?

cargo test

AI Disclosure

• I am a human and didn't use any AI.
• I used LLM features of my editor, but not an agent.
• I used an AI agent interactively.
• I am an agent or I got an agent to do the work autonomously.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have considered splitting this into smaller pull requests.