Correctly link the stream security documentation

Description

Stream security is a new feature of Opencast 2.2. It has been documented before the advent of docs.opencast.org and therefore, that documentation should be moved to docs.opencast.org.
Note that is should be done for r/2.2.x and that the documentation needs to be adapted since it comes from a pre-Karaf age.

Fixed and reviewed
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Assignee

Sven Stauber

Reporter

Sven Stauber