fix(docs): python version must be string

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: If5886f8adb391edf3771112cd8e20957a454eae0
(cherry picked from commit 3aa919eb278e7e0b23742ea043d79e1b1f1d75c6)
Signed-off-by: Yann Gautier <yann.gautier@st.com>
1 file changed