Merge remote-tracking branch 'upstream/develop' into 4.5

Author: kenjis

.gitattributes

@@ -12,7 +12,7 @@
 admin/ export-ignore
 contributing/ export-ignore
 .editorconfig export-ignore
-.nojekyll export-ignore export-ignore
+.nojekyll export-ignore
 CODE_OF_CONDUCT.md export-ignore
 CONTRIBUTING.md export-ignore
 

user_guide_src/source/images/debugbar.png

@@ -208,7 +208,7 @@ See :ref:`initial-configuration` for the details.
 Upgrading
 ---------
 
-Whenever there is a new release, then from the command line in your project root::
+Whenever there is a new release, then from the command line in your project root:
 
 .. code-block:: console