Werk #6325: Fixed broken "Parameter rule set" link on check manpages

Component	Setup
Title	Fixed broken "Parameter rule set" link on check manpages
Date	Jul 5, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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