Fix typo in comments for supportsSwitchingToNextInputMethod

        <!-- Set to true if this input method supports ways to switch to

             a next input method (e.g. a globe key.). When this is true and

             InputMethodManager#shouldOfferSwitchingToNextInputMethod() returns true,

             the IME has to offer ways to to invoke InputMethodManager#switchToNextInputMethod()

             the IME has to offer ways to invoke InputMethodManager#switchToNextInputMethod()

             accordingly.

             <p> Note that the system determines the most appropriate next input method

             and subtype in order to provide the consistent user experience in switching