docs: fix typo in table describing 4.16 development cycle

Fix s/4.17/4.16/ typo.

Fixes: 8962e40c ("docs: update kernel versions and dates in tables")
Cc: Tim Bird <tim.bird@sony.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/process/2.Process.rst

@@ -82,7 +82,7 @@ As an example, here is how the 4.16 development cycle went (all dates in
 	March 11	4.16-rc5
 	March 18	4.16-rc6
 	March 25	4.16-rc7
-	April 1		4.17 stable release
+	April 1		4.16 stable release
 	==============  ===============================
 
 How do the developers decide when to close the development cycle and create