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

This reverts commit 4873add6e11c1bd421c83cd08df589f1184aa673.

A fix has been put up for openbmc/openbmc#3720 so we can bring
this back now

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: If59020a5b502f70aa7149fbef4ad2f50824d1ce6
diff --git a/poky/documentation/sphinx-static/theme_overrides.css b/poky/documentation/sphinx-static/theme_overrides.css
index 55da38a..d235cb8 100644
--- a/poky/documentation/sphinx-static/theme_overrides.css
+++ b/poky/documentation/sphinx-static/theme_overrides.css
@@ -1,5 +1,5 @@
 /*
-    SPDX-License-Identifier: CC-BY-2.0-UK
+    SPDX-License-Identifier: CC-BY-SA-2.0-UK
 */
 
 body {