fix: trace 文档勘误

Close:#I4DSHY
Signed-off-by: NLiteOS2021 <dinglu@huawei.com>

zh-cn/device-dev/kernel/kernel-mini-memory-trace.md

@@ -174,7 +174,7 @@ OpenHarmony LiteOS-M内核的Trace模块提供下面几种功能，接口详细
 ```
 BOOL Example_HwiNumFilter(UINT32 hwiNum)
 {
-    if ((hwi == TIMER_INT) || (hwi == DMA_INT)) {
+    if ((hwiNum == TIMER_INT) || (hwiNum == DMA_INT)) {
         return TRUE;
     }
     return FALSE;

zh-cn/device-dev/kernel/kernel-small-debug-trace.md

@@ -189,7 +189,7 @@ OpenHarmony LiteOS-A内核的Trace模块提供下面几种功能，接口详细
 ```
 BOOL Example_HwiNumFilter(UINT32 hwiNum)
 {
-    if ((hwi == TIMER_INT) || (hwi == DMA_INT)) {
+    if ((hwiNum == TIMER_INT) || (hwiNum == DMA_INT)) {
         return TRUE;
     }
     return FALSE;