Werk #13099: Fix link to user guide in page menu

Component	User interface
Title	Fix link to user guide in page menu
Date	Aug 12, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The link to the user guide in page menu "Help" points to an 404 error page. This has been fixed.

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