DOC: Update backticks missing in pandas.DataFrame.query GH40375
- [ ] closes #40375 
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

A new suggestion was made to include code styling. 

Beginner's question: What is the procedure when my pull request (in this case #40400) is merged, which closes an issue after which a new suggestion for further improvement is made in the closed issue. Can I just implement the new suggestion and make a new pull request like this? Or is the procedure different?
