A small doc correction: --zk_max_versions is 50 by default
A small doc correction: --zk_max_versions is 50 by default

Test Plan: none

Reviewers: jenkins, timcharper, jdef

Reviewed By: jenkins, timcharper, jdef

Subscribers: jdef, marathon-dev

Differential Revision: https://phabricator.mesosphere.com/D850

mesosphere/marathon,Caerostris/marathon,Caerostris/marathon,gsantovena/marathon,mesosphere/marathon,mesosphere/marathon,gsantovena/marathon,janisz/marathon,gsantovena/marathon,janisz/marathon,meln1k/marathon,janisz/marathon,Caerostris/marathon,guenter/marathon,guenter/marathon,janisz/marathon,mesosphere/marathon,meln1k/marathon,janisz/marathon,guenter/marathon,mesosphere/marathon,gsantovena/marathon,guenter/marathon,guenter/marathon,gsantovena/marathon,Caerostris/marathon,meln1k/marathon,meln1k/marathon,Caerostris/marathon,meln1k/marathon