[PATCH v3.1 2/8] docs: conf.py: disable automarkup for Sphinx 3.x

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

The class types changed after the C domain rewrite on
Sphinx 3.x. Due to that, the automarkup extension is just
generating additional noise when trying to convert structs
and other markups into cross references.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

---

v3.1: Sphinx actually complains when append has more than one
item. So, let's call extensions.append() twice.

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 0a102d57437d..3875401486de 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -37,7 +37,7 @@ needs_sphinx = '1.3'
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include',
-              'kfigure', 'sphinx.ext.ifconfig', 'automarkup',
+              'kfigure', 'sphinx.ext.ifconfig',
               'maintainers_include', 'sphinx.ext.autosectionlabel' ]
 
 #
@@ -52,6 +52,7 @@ if major >= 3:
 	''')
 else:
     extensions.append('cdomain')
+    extensions.append('automarkup')
 
 # Ensure that autosectionlabel will produce unique names
 autosectionlabel_prefix_document = True