Documentation: Options typo for esversion 10

[jp-larose]

In the page https://jshint.com/docs/options/, there's a typo in the link in the description for esversion bullet point for 10. It's causing the URL to include the trailing ')'. I think it's missing the '[' in front of "ECMAScript 10]".

[matt-nelson1]

I noticed that too—@jugglinmike @caitp. Also FYI, there are many pages on JSHint.com that aren't synched with the GitHub repo. Probably needs a fresh sync.