[kernel]update format

Author: yangjie11

src/idle.c

@@ -167,7 +167,7 @@ void rt_thread_defunct_enqueue(rt_thread_t thread)
 
 /**
  * @brief Dequeue a thread from defunct queue.
- * 
+ *
  * @note It must be called between rt_hw_interrupt_disable and rt_hw_interrupt_enable.
  */
 rt_thread_t rt_thread_defunct_dequeue(void)

src/mem.c

@@ -618,11 +618,11 @@ RTM_EXPORT(rt_free);
 
 #ifdef RT_MEM_STATS
 /**
-* @brief This function will caculate the total memory, the used memory, and 
+* @brief This function will caculate the total memory, the used memory, and
 *        the max used memory.
 *
 * @param total is a pointer to get the total size of the memory.
-* 
+*
 * @param used is a pointer to get the size of memory used.
 *
 * @param max_used is a pointer to get the maximum memory used.

src/slab.c

@@ -920,11 +920,11 @@ RTM_EXPORT(rt_free);
 
 #ifdef RT_MEM_STATS
 /**
-* @brief This function will caculate the total memory, the used memory, and 
+* @brief This function will caculate the total memory, the used memory, and
 *        the max used memory.
 *
 * @param total is a pointer to get the total size of the memory.
-* 
+*
 * @param used is a pointer to get the size of memory used.
 *
 * @param max_used is a pointer to get the maximum memory used.