Docs-change: how UserManager.ENSURE_VERIFY_APPS affects profiles.

Noted affected users for versions prior to Android O.
Staged at: go/dac-stage/reference/android/os/UserManager.html#ENSURE_VERIFY_APPS

Test: make ds-docs and output staged
Bug: 38024373
Change-Id: Ida80c2134bdd4013c7adabee778e8296039747a2