Kindsys: Extend DocsJenny with support for 'allOf' (#62558)

* Kindsys: Extend DocsJenny with support for 'allOf'

* Update generated docs

* Multiple refinements

* Minor fixes

* Undo undesired changes

* Fix

* Fix linter complains

---------

Co-authored-by: Tania B <yalyna.ts@gmail.com>

pkg/codegen/tmpl/docs.tmpl

@@ -6,9 +6,11 @@ title: {{ .KindName }} kind
 ---
 > Both documentation generation and kinds schemas are in active development and subject to change without prior notice.
 
-# {{ .KindName }} kind
+## {{ .KindName }}
 
-## Maturity: {{ .KindMaturity }}
-## Version: {{ .KindVersion }}
+#### Maturity: {{ .KindMaturity }}
+#### Version: {{ .KindVersion }}
+
+{{ .KindDescription }}
 
 {{ .Markdown }}