docs: Add recommonmark to extension list

Signed-off-by: Robert Winkler <rwinkler@antmicro.com>

docs/conf.py

diff --git a/docs/conf.py b/docs/conf.py
index 7e8d7c0..d9ac409 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -53,7 +53,8 @@
     'sphinx.ext.imgmath',
     'sphinx.ext.napoleon',
     'sphinx.ext.todo',
-    'sphinx_markdown_tables'
+    'sphinx_markdown_tables',
+    'recommonmark'
 ]
 # yapf: enable