Docs: fix a broken link

[chenxsan]

Prerequisites checklist

• I have read the contributing guidelines.

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

[x] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

Fix a broken link. The right one would be https://eslint.org/docs/developer-guide/working-with-rules#the-context-object instead of https://eslint.org/docs/developer-guide/working-with-rules#The-Context-Object, the later one won't scroll to respective heading.

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

Nothing.

[snitin315]

Good catch, Thanks for contributing.

[mdjermanovic]

LGTM, thanks!