Docs: Fix typos in Issues section of Maintainer's Guide

[kaicataldo]

What is the purpose of this pull request? (put an "X" next to item)

[X] Documentation update
[ ] Bug fix ([template](https://github.com/eslint/eslint/blob/master/templates/bug-report.md))
[ ] New rule ([template](https://github.com/eslint/eslint/blob/master/templates/rule-proposal.md))
[ ] Changes an existing rule ([template](https://github.com/eslint/eslint/blob/master/templates/rule-change-proposal.md))
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

If the item you've check above has a template, please paste the template questions here and answer them.

Please check each item to ensure your pull request is ready:

• I've read the pull request guide
• I've included tests for my change
• I've updated documentation for my change (if appropriate)

What changes did you make? (Give an overview)
Fixed two typos that slipped through in my last PR for the Issues section of the Maintainer's Guide

Is there anything you'd like reviewers to focus on?
Nope!

[mention-bot]

@kaicataldo, thanks for your PR! By analyzing the annotation information on this pull request, we identified @nzakas to be a potential reviewer

[eslintbot]

LGTM

[platinumazure]

LGTM, thanks @kaicataldo!