bug in path, /MM/ instead /mm/

mm/README.md

@@ -3,4 +3,4 @@
 This chapter describes memory management in the linux kernel. You will see here a
 couple of posts which describe different parts of the linux memory management framework:
 
-* [Memblock](https://github.com/0xAX/linux-insides/blob/master/MM/linux-mm-1.md) - describes early `memblock` allocator.
+* [Memblock](https://github.com/0xAX/linux-insides/blob/master/mm/linux-mm-1.md) - describes early `memblock` allocator.