Fix typo in documentation (#1677)

Author: Aric5301

CMSIS/DoxyGen/RTOS2/src/cmsis_os2_Event.txt

@@ -301,7 +301,7 @@ The function \b osEventFlagsGetName returns the pointer to the name string of th
 \code
 #include "cmsis_os2.h"                          // CMSIS RTOS header file
 
-osEventFlagsId_t evt_id;                        // event flasg id
+osEventFlagsId_t evt_id;                        // event flags id
 
 void EvtFlagsGetName_example (void)  {
   char *name;

CMSIS/RTOS2/RTX/Template/Events.c

@@ -6,7 +6,7 @@
 
 #define FLAGS_MSK1 0x00000001U
 
-osEventFlagsId_t evt_id;                        // event flasg id
+osEventFlagsId_t evt_id;                        // event flags id
 
 osThreadId_t tid_Thread_EventSender;            // thread id 1
 osThreadId_t tid_Thread_EventReceiver;          // thread id 2