Corrected JSdoc typo

[Rudxain]

The URL in the Wikipedia link (of AverageMean.js) had an extra "h" in the URI Scheme (the part that specifies the protocol, usually https). I removed the duplicate "h" and made it into a single "h", now the link works. I have not plagiarized (because I'm not claiming work as mine), but the pull request contains work (the algorithm) from someone else, so I left the box unchecked because I didn't know what to do.

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Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.