fixes required to merge

Author: robbiejackson

docs/general-concept/namespace.md

@@ -1,3 +1,6 @@
+---
+title: Namespaces
+---
 Namespacing was progressively introduced for Joomla classes over a number of Joomla 3.x releases. In Joomla 4 nearly all of the Joomla classes were namespaced, and it was expected that Joomla extensions were namespaced as well.
 
 If you're not familiar with PHP namespacing then you can find general information online, for example at https://www.php.net/manual/en/language.namespaces.php