Revert "poky: subtree update:b23aa6b753..ad30a6d470"

This reverts commit af5e4ef732faedf66c6dc1756432e9de2ac72988.

This commit introduced openbmc/openbmc#3720 and no solution has been
forthcoming. Revert until we can get to the bottom of this.

Change-Id: I2fb0d81eb26cf3dadb2f2abdd1a1bb7a95eaf03c
diff --git a/poky/documentation/conf.py b/poky/documentation/conf.py
index ebc26aa..80d5e8e 100644
--- a/poky/documentation/conf.py
+++ b/poky/documentation/conf.py
@@ -1,6 +1,6 @@
 # Configuration file for the Sphinx documentation builder.
 #
-# SPDX-License-Identifier: CC-BY-SA-2.0-UK
+# SPDX-License-Identifier: CC-BY-2.0-UK
 #
 # This file only contains a selection of the most common options. For a full
 # list see the documentation: