docs: fixed misleading comment about the array method (forEach instead of reduce) used in AverageMean.js

[HRIDYANSHU054]

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Describe your change:

• Documentation change?
  what was wrong?
  wrong array method in comment

Before:

// This loop sums all values in the 'nums' array using forEach loop const sum = nums.reduce((sum, cur) => sum + cur, 0)

After:

// This calculates the sum of all values in the 'nums' array using reduce method.  const sum = nums.reduce((sum, cur) => sum + cur, 0)

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 their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.76%. Comparing base (ff314a2) to head (d0e1ba9).

Additional details and impacted files

@@ Coverage Diff @@ ## master #1727 +/- ## ========================================== - Coverage 84.76% 84.76% -0.01%  ========================================== Files 378 378 Lines 19742 19738 -4 Branches 2955 2957 +2 ========================================== - Hits 16735 16731 -4  Misses 3007 3007 

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[appgurueu]

Just remove the comment. It adds no value.

[HRIDYANSHU054]

@appgurueu Done.

[HRIDYANSHU054]

@raklaptudirm please review the changes