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 98.62%. Comparing base (6920c14) to head (d995b56).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1071   +/-   ##
=========================================
  Coverage     98.62%   98.62%           
  Complexity     1654     1654           
=========================================
  Files           120      120           
  Lines          4306     4306           
=========================================
  Hits           4247     4247           
  Misses           59       59           

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