Update mem doc example formatting

core/mem/doc.odin

@@ -5,14 +5,14 @@ package mem implements various types of allocators.
 An example of how to use the `Tracking_Allocator` to track subsequent allocations
 in your program and report leaks and bad frees:
 
-```odin
+Example:
 	package foo
 	
 	import "core:mem"
 	import "core:fmt"
 	
 	_main :: proc() {
-	do stuff
+		// do stuff
 	}
 	
 	main :: proc() {
@@ -30,6 +30,5 @@ main :: proc() {
 			fmt.printf("%v allocation %p was freed badly\n", bad_free.location, bad_free.memory)
 		}
 	}
-```
 */
 package mem