Flag mixing up "proof" and "prove"

**The Error**

It's usually made by nonnative speakers who don't realize we have two words or just can't remember which one is which.

**Examples**
1. Giant Virus **Proofs** Life Evolved Differently Than We Thought

"proof" is typically a noun but it's also a verb that's not really rare, meaning "to proofread". This is why it's not included in the `NounVerbConfusion` linter.

Start by locating the NounVerbConfusion linter and its existing tests, then review how it distinguishes nouns from verbs. Add coverage for the proof/prove confusion while preserving proof as a valid verb meaning to proofread; done means the example is flagged without introducing false positives for that usage.

Written by the indexing model from the issue text.