code: function rightTooSmall(node) {
  		if (balanceFactor(node) <= 1) { return node; }   // Right is not too small, don't change
  		if (balanceFactor(node.left) < 0) {leftRotation(node.left);}
  		return rightRotation(node);
  	}
docs: Modify the tree if its right subtree is too small compared to the left
  Return the new root if any