Make minor copy edits to mbed_wait_api.h

Make minor edits to existing text.

Author: Amanda Butler

platform/mbed_wait_api.h

@@ -66,8 +66,8 @@ void wait(float s);
  *  @param ms the whole number of milliseconds to wait
  *
  *  @note
- *    If the RTOS is present, it calls ThisThread::sleep_for() which is same as CMSIS osDelay()
- *    Not callable from interrupts, doesn't lock hardware sleep.
+ *    If the RTOS is present, it calls ThisThread::sleep_for(), which is same as CMSIS osDelay().
+ *    You can't call this from interrupts, and it doesn't lock hardware sleep.
  */
 void wait_ms(int ms);