Update report14.md

lec14/report14.md

@@ -30,7 +30,7 @@
 ### How to control static and global variable?
 * static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZERS;
 
-    pthread_mutex_lock(&mutex);
-    count++;
-    pthread_mutex_unlock(&mutex);
+    pthread_mutex_lock(&mutex); <br>
+    count++; <br>
+    pthread_mutex_unlock(&mutex); <br>