Added details for osThreadJoin ..
.. which causes undefined behaviour when called
simultaneously from multiple threads.
@@ -551,7 +551,10 @@ Possible \ref osStatus_t return values:
- \em osErrorResource: the thread is in an invalid state (ex: not joinable).
- \em osErrorISR: the function \b osThreadJoin cannot be called from interrupt service routines.
-\note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
+\note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines". <br>
+\note Only one thread shall call \b osThreadJoin to join the target thread. If multiple threads try to join simultaneously with the same thread,
+ the results are undefined.
+
*/
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