Update doc for Query::join() methods

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.46%. Comparing base (21fd5bb) to head (14291d6).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1071   +/-   ##
=========================================
  Coverage     98.46%   98.46%           
  Complexity     1655     1655           
=========================================
  Files           117      117           
  Lines          4354     4354           
=========================================
  Hits           4287     4287           
  Misses           67       67           

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