Revert 9ade7aa9a7572213f24774347587a453ea88c3e9...3ddd17034b922e41c0d0b8ec85f71dfc813a1992 on SliceTricks

SliceTricks.md

@@ -29,12 +29,12 @@ a = append(a[:i], a[i+1:]...)
 a = a[:i+copy(a[i:], a[i+1:])]
 ```
 
-> **Delete without preserving order**
+#### Delete without preserving order
 ```go
-a[i] = a[len(a)-1]
+a[i] = a[len(a)-1] 
 a = a[:len(a)-1]
-```
 
+```
 **NOTE** If the type of the element is a _pointer_ or a struct with pointer fields, which need to be garbage collected, the above implementations of ` Cut ` and ` Delete ` have a potential _memory leak_ problem: some elements with values are still referenced by slice ` a ` and thus can not be collected. The following code can fix this problem:
 > **Cut**
 ```go