Fix typo (isearch-mode-map)

[Nyoho]

Description

Fix typo (isearch-mode-map)

Checklist

• [x] I've read CONTRIBUTING.org.
  • [x] I've assign FSF.
  • [ ] The leaf.el after my changed pass all testcases by make test.
  • [ ] My changed elisp code byte-compiled cleanly.
  • [ ] I've added testcases related to my PR.
  • [ ] I've fixed README related the my added testcases.

[conao3]

Good, thanks! One point, why is this PR a draft? If you'd like to merge it, please undraft it.

[Nyoho]

The reason why I leave it a draft is that I have not run the test.

[Nyoho]

It's not necessary for document correction though... hehehe

[conao3]

lol. Good catch, thanks!

[Nyoho]

Thank you for merging!