Update description of limit() function in rate_limiter

[Amronos]

Fixes #416.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.38%. Comparing base (ff1f2d6) to head (9997775).

Additional details and impacted files

@@             Coverage Diff              @@
##           ros2-master     #425   +/-   ##
============================================
  Coverage        78.38%   78.38%           
============================================
  Files               30       30           
  Lines             1888     1888           
  Branches           114      114           
============================================
  Hits              1480     1480           
  Misses             338      338           
  Partials            70       70           

Flag	Coverage Δ
unittests	78.38% <ø> (ø)

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Files with missing lines	Coverage Δ
...l_toolbox/include/control_toolbox/rate_limiter.hpp	73.01% <ø> (ø)

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