Bug: 139186570
Test: make docs
As part of enforcing Scoped Storage for the next Android release, we're
encouraging app developers to steer away from using raw file path access
and, instead, use FileDescriptor or Uri to access files.
Update createSource(File)'s docs to suggest why they might want to use a
different method.
Update the top level example to use createSource(ContentResolver, Uri)
instead of createSource(File).
Change-Id: Icbccdb5183edd0b6a052ec905f999f02ac4e61d3
(cherry picked from commit 4056974583)
Merged-In: Icbccdb5183edd0b6a052ec905f999f02ac4e61d3
e9b2cc829e