doc: Remove reference to NetRestrict wildcards

doc: Remove reference to NetRestrict wildcards

Commit 80fc888a9223050481de932233fe7121a48df194 got some of this, but
forgot the other reference. We don't support these anywhere, so remove
it here, too.

FIXES 125340

Reviewed-on: http://gerrit.openafs.org/7564
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 4ae005062e2c927b77ea23d95934d5af463878b3)

Change-Id: I2880b5a0caf283324290ffd8f9c25194551e58cd
Reviewed-on: http://gerrit.openafs.org/7589
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>