Fix javadoc for some user restrictions.

DISALLOW_UNMUTE_MICROPHONE and DISALLOW_ADJUST_VOLUME can
be set by POs on secondary users as well. But they have no
effect on managed profiles.

(In the bug I erroneously mentionted DISALLOW_UNMUTE_DEVICE
which is @hidden instead of *_MICROPHONE).

Bug: 36024135
Test: IntelliJ quickdoc popup renders correctly.
Change-Id: I7a0e77ac993846cdc3a4ddf4d457e1282872107f