Merge branch 'bugfix/esp_event_err_docs' into 'master'

fix(core-system/esp event): Fixed missing error return  documentation for...

Closes IDFGH-10499

See merge request espressif/esp-idf!24417

components/esp_event/include/esp_event.h

@@ -63,6 +63,7 @@ esp_err_t esp_event_loop_delete(esp_event_loop_handle_t event_loop);
  * @return
  *  - ESP_OK: Success
  *  - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
+ *  - ESP_ERR_INVALID_STATE: Default event loop has already been created
  *  - ESP_FAIL: Failed to create task loop
  *  - Others: Fail
  */