[API-31 enumification] Fix some enum namespaces names (#6177)

Context: 8843808

We enumified API-31 constants in commit 8843808.  However, some of
the namespaces used for these enums did not reflect the changes we
apply with `metadata` for capitalization or plurality purposes.

A later "verify any new namespaces added" check on @jpobst 's machine
revealed these changes.  (TODO: Export that tool off his machine.)

For example, the following namespaces were renamed:

  * `Android.App.Appsearch` to `Android.App.AppSearch`.
  * `Android.Location` to `Android.Locations`.