Adds missing documentation in the cell delegate

Author: Andres Ugarte

src/core/UI/cells/RMXCell.h

@@ -31,6 +31,10 @@ extern const CGFloat RMXCellHeightLarge;
 
 @protocol RMXCellDelegate <NSObject>
 
+/**
+ Called by the cell when it requires the overlay to go full screen.
+ One example use case is when the keyboard appears.
+ */
 - (void)cellRequestedFullScreenOverlay:(RMXCell *)cell;
 
 @end

src/core/UI/cells/RMXCellTextInput.m

@@ -55,7 +55,6 @@ - (void)layoutSubviews {
 
 - (void)prepareForReuse {
   [super prepareForReuse];
-
   _textField = nil;
 }