feat: correct "heed off" etc.

[hippietrail]

Issues

Work in progress implementing #3932

Description

Addresses a range of mistakes centred around "heed off" mixing up "take heed of", "head off", and "ward off".

How Has This Been Tested?

It's still in development.

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.

If Your PR Implements or Enhances a Linter

• I made up the sentences in the unit tests.
• The sentences in the unit tests were generated by an AI.
• I'm using examples from the bug report / feature request.
• I collected real-world sentences for the unit tests.

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.