fix typo in shell
@@ -40,7 +40,7 @@ typedef struct {
* @param[in] str - command's first string(Example: ps, ls, ifconfig etc)
* @param[in] cb - callback function for the command
* @param[in] thread_exec: TASH_EXECMD_ASYNC-execute callback as a thread
- TASH_EXECMD_SYNC -invokde callback directly
+ TASH_EXECMD_SYNC -invoked callback directly
* @retval 0 Success
* @retval -ve Failure
*
