Add documentation for 'rndc reset-stats'.
If a zone is specified, this command reloads only the given zone.
If no zone is specified, the reloading happens asynchronously.
+.. option:: reset-stats
+
+ This command resets the requested statistics counters.
+
+ .. program:: rndc reset-stats
+ .. option:: counter-name ...
+
+ At least one counter name must be provided. Currently the following counters
+ are supported: ``recursive-high-water``, ``tcp-high-water``.
+
.. program:: rndc
.. option:: responselog [on | off]