feat: on stock→in stock

[hippietrail]

Issues

N/A

Description

I was reading something online where the writer used "on stock" instead of the usual "in stock".
This kind of wrong preposition error is extremely common, especially among nonnative speakers, since prepositions are quirky.

As always there's lots of context that comes into play so some fuzz testing would be appreciated to make sure there are no false positives.

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.

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.