Add property shouldShowPlaceholderWhenFirstResponder.

Setting to YES means that the UITextView’s placeholder text (if present) will continue to display after the UITextView has become the first responder (from having been tapped, e.g.) and until at least 1 character is entered. An example of this is iMessage in iOS and Messages.
Setting to NO means that the UITextView’s placeholder text will immediately disappear after the UITextView has become the first responder.

Some code clean up as well.
Modified textViewDidBeginEditing to immediately check if the text view should update to show or not show it’s placeholder, if it has one.

Removed deprecated code in heightForTextView

Removed what seemed to be unneeded to code from viewDidLoad
Updated to display all “other” guidelines together in a single section.
All “other” guidelines (every other guideline that isn’t the “next” guideline, i.e.) are now be displayed in a single section.

(Before other guidelines that had been updated were in one section and the non updated (remaining) guidelines were in a separate section.)