Docs: Fix examples for no-useless-escape

[koba04]

What is the purpose of this pull request? (put an "X" next to 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 correct examples for no-useless-escape.

• https://eslint.org/docs/rules/no-useless-escape

Currently, the correct example occurs no-useless-escape errors.
So I've fixed the examples.

Current(copy and paste from the page)

• https://eslint.org/demo/#eyJ0ZXh0IjoiXCJcXFwiXCI7XG4nXFwnJztcblwiXFx4MTJcIjtcblwiXFx1MDBhOVwiO1xuXCJcXDM3MVwiO1xuXCJ4c1xcdTIxMTFcIjtcbmBcXGBgO1xuYFxcJHske2Zvb31cXH1gO1xuYCRcXHske2Zvb31cXH1gO1xuL1xcXFwvZztcbi9cXHQvZztcbi9cXHdcXCRcXCpcXF5cXC4vOyIsIm9wdGlvbnMiOnsicGFyc2VyT3B0aW9ucyI6eyJlY21hVmVyc2lvbiI6Niwic291cmNlVHlwZSI6InNjcmlwdCIsImVjbWFGZWF0dXJlcyI6e319LCJydWxlcyI6eyJuby11c2VsZXNzLWVzY2FwZSI6Mn0sImVudiI6e319fQ==

Fixed version

• https://eslint.org/demo/#eyJ0ZXh0IjoiXCJcXFwiXCI7XG4nXFwnJztcblwiXFx4MTJcIjtcblwiXFx1MDBhOVwiO1xuXCJcXDM3MVwiO1xuXCJ4c1xcdTIxMTFcIjtcbmBcXGBgO1xuYFxcJHske2Zvb319YDtcbmAkXFx7JHtmb299fWA7XG4vXFxcXC9nO1xuL1xcdC9nO1xuL1xcd1xcJFxcKlxcXlxcLi87Iiwib3B0aW9ucyI6eyJwYXJzZXJPcHRpb25zIjp7ImVjbWFWZXJzaW9uIjo2LCJzb3VyY2VUeXBlIjoic2NyaXB0IiwiZWNtYUZlYXR1cmVzIjp7fX0sInJ1bGVzIjp7Im5vLXVzZWxlc3MtZXNjYXBlIjoyfSwiZW52Ijp7fX19

Actually, this is a useless escape.

• https://jsfiddle.net/koba04/f1t7qr1n/

Thanks!

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

[platinumazure]

LGTM, thanks for contributing!

[platinumazure]

Merged, thanks @koba04 for contributing! Feel free to create a new issue on the other possibly useless escape, if you like.

[koba04]

Thanks!