docs: recommend that DISALLOW_CROSS_PROFILE_COPY_PASTE is accompanied by setScreenCaptureDisabled().

Clarified the scope of the restriction (export-only).

Bug: 77204173
Test: javadoc UserManager.java and inspect generated HTML
Change-Id: Iec4cf141741dfec6942decf6ef3f237d5eaa48f2
1 file changed