Revert "Make Javadoc changes to TtsSpan related to new API"

This reverts commit abff2386df0fb9edb5a6b304a1ddb6deb91cbc52.

Reason for revert: I forgot I shouldn't merge.

Change-Id: Ic8be07f0d0ba45fbeb6e391cdc486cb1449f971b
1 file changed