Fenced in code blocks for Syntax Highlighting (#23698)

guide/english/go/go-pointers/index.md

@@ -14,19 +14,19 @@ Pointers
 Go has pointers. A pointer holds the memory address of a value.
 
 The type *T is a pointer to a T value. Its zero value is nil.
-
+```go
 var p *int
-
+```
 The & operator generates a pointer to its operand.
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+```go
 i := 42
 p = &i
-
+```
 The * operator denotes the pointer's underlying value.
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+```go
 fmt.Println(*p) // read i through the pointer p
 *p = 21         // set i through the pointer p
-
+```
 This is known as "dereferencing" or "indirecting".
 
 Unlike C, Go has no pointer arithmetic.