docs: Remove 'language' configuration

'None' is no longer a valid value for 'language' in Sphinx 5.0.

Signed-off-by: Stephen Finucane <stephen@that.guru>

docs/conf.py

@@ -45,13 +45,6 @@
 # The full version, including alpha/beta/rc tags.
 release = ''
 
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-#
-# This is also used if you do content translation via gettext catalogs.
-# Usually you set "language" from the command line for these cases.
-language = None
-
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path