Merge "Update docs for RttCall#write"

        /**

         * Writes the string {@param input} into the outgoing text stream for this RTT call. Since

         * RTT transmits text in real-time, this method should be called once for each character

         * the user enters into the device.

         * RTT transmits text in real-time, this method should be called once for each user action.

         * For example, when the user enters text as discrete characters using the keyboard, this

         * method should be called once for each character. However, if the user enters text by

         * pasting or autocomplete, the entire contents of the pasted or autocompleted text should

         * be sent in one call to this method.

         *

         * This method is not thread-safe -- calling it from multiple threads simultaneously may

         * lead to interleaved text.