Update SUMMARY.md

SUMMARY.md

@@ -46,7 +46,8 @@
    * [initrd]()
 * [Misc](Misc/README.md)
     * [How kernel compiled](Misc/how_kernel_compiled.md)
-    * [Write and Submit your first Linux kernel Patch]() 
+    * [Linkers](Misc/linkers.md)
+    * [Write and Submit your first Linux kernel Patch]()
     * [Data types in the kernel]()
 * [Useful links](LINKS.md)
 * [Contributors](contributors.md)