fix whitespace

core/mem/doc.odin

@@ -7,22 +7,22 @@ in your program and report leaks and bad frees:
 
 Example:
 	package foo
-	
+
 	import "core:mem"
 	import "core:fmt"
-	
+
 	_main :: proc() {
 		// do stuff
 	}
-	
+
 	main :: proc() {
 		track: mem.Tracking_Allocator
 		mem.tracking_allocator_init(&track, context.allocator)
 		defer mem.tracking_allocator_destroy(&track)
 		context.allocator = mem.tracking_allocator(&track)
-	
+
 		_main()
-	
+
 		for _, leak in track.allocation_map {
 			fmt.printf("%v leaked %m\n", leak.location, leak.size)
 		}