docs: update requirements to install six module

On the update of Sphinx version to 2.4.4, the "six" library won't be
installed automatically. (which is required by kfigure.py)

Main reason of this issue were occurred by the requirements changed from
the sphinx library. In Sphinx v1.7.9, six was listed on the
install_requires, but it has been removed since 2.x

The kfigure.py uses six library explicitly, adding six to
requirements.txt seems reasonable

Signed-off-by: JaeSang Yoo <jsyoo5b@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20201208014628.GA1361@JSYoo5B-Base.localdomain
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/sphinx/requirements.txt b/Documentation/sphinx/requirements.txt
index 489f6626de6740374b0fdbb9f14d24243fecfdf2..5030d346d23bc8f178b5b2c11458c52543a855ed 100644 (file)
--- a/Documentation/sphinx/requirements.txt
+++ b/Documentation/sphinx/requirements.txt
@@ -1,3 +1,4 @@
 docutils
 Sphinx==2.4.4
 sphinx_rtd_theme
+six