What is the reset keyboard dictionary for (settings> reset> reset keyboard dictionary) ??
What is the reset keyboard dictionary option for? (settings> general> reset> reset keyboard dictionary)
iPad 2, iOS 5.0.1
It removes any words that you've added to the user dictionary :
You add words to the keyboard dictionary by rejecting words iPad suggests as you type. Tap a word to reject the correction and add the word to the keyboard dictionary. Resetting the keyboard dictionary erases all words you’ve added.