Documentation: stable-kernel-rules: fix broken git urls

git.kernel.org links don't work (fatal: repository ... not found).
Update them with the current style from https://git.kernel.org

There is no HTTP option, so also switch HTTP -> HTTPS.
Signed-off-by: Andrii Bordunov <andrew.bordunov@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/process/stable-kernel-rules.rst

@@ -166,12 +166,12 @@ Trees
  - The queues of patches, for both completed versions and in progress
    versions can be found at:
 
-	http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
+	https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git
 
  - The finalized and tagged releases of all stable kernels can be found
    in separate branches per version at:
 
-	http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git
+	https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
 
 
 Review committee