Clarified app behavior on REQUEST_TYPE_NONE

Indicated that when this request type is returned in response
to a getKeyRequest no license exchange is required and
the key is available for use.

Bug: 73750909
Test: javadocs change only. Compiled Sailfish.
Change-Id: I4f124158160bf7e74f0228788c7b24bcefbb5dd0
1 file changed