Fixed ping_interval docs regarding its relation with wait_timeout

[anarthal]

close #391

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.95%. Comparing base (41597b7) to head (85b79d0).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #392   +/-   ##
========================================
  Coverage    98.95%   98.95%           
========================================
  Files          142      142           
  Lines         7186     7186           
========================================
  Hits          7111     7111           
  Misses          75       75           

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