Documentation: Fix broken link

Link to Linux kernel coding style changed, fix it.

Change-Id: I9792d360d301b93c255306488c90375c6cc882c4
Signed-off-by: Lance Zhao <lance.zhao@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65959
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: John Zhao <john.zhao@intel.com>
Reviewed-by: Bora Guvendik <bora.guvendik@intel.com>
diff --git a/Documentation/contributing/coding_style.md b/Documentation/contributing/coding_style.md
index 3314030..67f320a 100644
--- a/Documentation/contributing/coding_style.md
+++ b/Documentation/contributing/coding_style.md
@@ -3,7 +3,7 @@
 This document describes the preferred C coding style for the
 coreboot project. It is in many ways exactly the same as the Linux
 kernel coding style. In fact, most of this document has been copied from
-the [Linux kernel coding style](http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Documentation/CodingStyle?id=HEAD)
+the [Linux kernel coding style](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/Documentation/process/4.Coding.rst)
 
 The guidelines in this file should be seen as a strong suggestion, and
 should overrule personal preference. But they may be ignored in