docs: process: fix a typoed cross-reference

Commit 329ac9af added a cross-reference missing a hyphen; add one from
my emergency hyphen stash.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 329ac9af ("docs: submitting-patches: Discuss interleaved replies")
Closes: https://lore.kernel.org/oe-kbuild-all/202305201652.POM84URe-lkp@intel.com/Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/process/2.Process.rst

@@ -437,7 +437,7 @@ There are a few hints which can help with linux-kernel survival:
 - Use interleaved ("inline") replies, which makes your response easier to
   read. (i.e. avoid top-posting -- the practice of putting your answer above
   the quoted text you are responding to.) For more details, see
-  :ref:`Documentation/process/submittingpatches.rst <interleaved_replies>`.
+  :ref:`Documentation/process/submitting-patches.rst <interleaved_replies>`.
 
 - Ask on the correct mailing list.  Linux-kernel may be the general meeting
   point, but it is not the best place to find developers from all