docs: Remove the copyright year from conf.py

It had gone stale, of course, as it would every year, a single date doesn't
really cover things, and the date isn't really needed anyway.

Documentation/conf.py

@@ -58,7 +58,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = 'The Linux Kernel'
-copyright = '2016, The kernel development community'
+copyright = 'The kernel development community'
 author = 'The kernel development community'
 
 # The version info for the project you're documenting, acts as replacement for