Docs: Fix examples for no-restricted-properties

[not-an-aardvark]

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
• (n/a) I've included tests for my change
• I've updated documentation for my change (if appropriate)

What changes did you make? (Give an overview)

This fixes the example configuration for no-restricted-properties. The current example is invalid and causes ESLint to exit with an error when used.

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

Nothing in particular.

[mention-bot]

@not-an-aardvark, thanks for your PR! By analyzing the annotation information on this pull request, we identified @TheSavior to be a potential reviewer

[eslintbot]

LGTM

[TheSavior]

Whoops. LGTM.

[platinumazure]

LGTM. (I'm just checking with the team to make sure we can merge this even if we might have a patch release next Monday.)

[platinumazure]

Thanks for the PR, @not-an-aardvark!