[BUGFIX] Fix doc comment about string comparison in IfViewHelper
[BUGFIX] Fix doc comment about string comparison in IfViewHelper

The inline documentation in the ``IfViewHelper`` states, that strings
can not be compared directly but arrays should be used as workaround.
This isn't true anymore since direct string comparison works.

Change-Id: Ib6ff6d2f51e5ea9095d1f96051be2a29cfced993
Fixes: FLOW-328
Releases: master, 3.0
Original-Commit-Hash: 7c4bafc7fb3a8edfa9392ec1991081d5660577e2

neos/fluid,neos/fluid