chore(docs): reformat sphinx configuration

Format the configuration file to follow our coding guidelines and common
Python style conventions.

Change-Id: Ic83372287db08df0662f562f7683a02ddff0bac8
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
(cherry picked from commit 29b11baf6b2e599a4305a11f2580ae4572bec564)
Signed-off-by: Yann Gautier <yann.gautier@st.com>
1 file changed