Enable doc-validator for alerting directories (#68964)

* Enable doc-validator for alerting directories

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Adds missing description frontmatter

* Fix some more links

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Fix some more links

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Fixes anchors

---------

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>
Co-authored-by: brendamuir <100768211+brendamuir@users.noreply.github.com>

docs/sources/developers/http_api/alerting_provisioning.md

@@ -13,7 +13,7 @@ keywords:
 title: 'Alerting Provisioning HTTP API '
 ---
 
-# Alerting provisioning API
+# Alerting provisioning HTTP API
 
 ## Information