fix lang id (#4111)

mairaw · web-flow · commit 66489f08f68e · 2020-04-15T10:52:54.000-07:00
diff --git a/xml/System.Collections.Generic/List`1.xml b/xml/System.Collections.Generic/List`1.xml
@@ -4317,7 +4317,7 @@ SyncLock ic.SyncRoot
 End SyncLock  
 ```  
   
-```cpp#  
+```cpp
 ICollection^ ic = ...;  
 try   
 {  
