docs: Typo fix (android.permissions -> android.permission)

A couple of code snippets in a doc comment incorrectly referred to the "android.permissions.FOREGROUND_SERVICE_SPECIAL_USE" permission name; this should actually be "android.permission.FOREGROUND_SERVICE_SPECIAL_USE" (permission, not permissions), per:

https://developer.android.com/reference/android/Manifest.permission#FOREGROUND_SERVICE_SPECIAL_USE

Docs-only change, no change to actual source code.

Bug: 299736596
Change-Id: I630f13c19bfb2418ff4feb1c20ac4540ba0e8ef6
Test: [go/abtd docs build]