Missed removing this subheading when the Offline Library feature was shelved.
Steps to reproduce
Go to the app's settings screen and scroll down to the 'About' section of the app.
Expected
The subheading "Experimental" which used to appear over the experimental Offline Library setting should no longer be shown (since the Offline Library has already been removed).
Actual
The subheading "Experimental" is still shown, appearing just before the "About" subheading.