Update the content shell command's usage instructions.

The usage instructions of the content shell command were missing some
excape charecters which caused the examples not to work. As a result
of the incorrect instructions users are prone to constructing incorrect
commands.

bug:7526252

Change-Id: I2fcc4dd1fd05806fe951245651b97e40a4786d24
Removing the plus page when we reach the max number of allowable widgets. (Bug 7564782)

- Also adding feedback on the plus page (Bug 7500328)

Change-Id: Iddd09b7a3d5347a43bc040052114879cbaecccd9
Removing unecessary additional lock metadata from QuickSettings user tile.

Change-Id: I89ec94385eb3cdd46ad6942bf8989fb04d5c0370