Improve notification message

Improve the language of system notification when user ejects SD card in adoptable storage so that it can be conveyed to the user as to why it is bad

Test: Manual testing on Jiophone next device
Screenshot: https://screenshot.googleplex.com/rfuZu4sk2Kinob9.png
Bug: 201252175

Change-Id: Ib01f94cc37279800d23c1bbe71a0abde51624dcd
(cherry picked from commit 6a0034a4)
Merged-In: Ib01f94cc37279800d23c1bbe71a0abde51624dcd