[7.13] [DOCS] Fix URL in alerting API (#209594) (#209617)

# Backport

This will backport the following commits from `7.17` to `7.13`:
- [[DOCS] Fix URL in alerting API
(#209594)](#209594)

<!--- Backport version: 9.6.4 -->

### Questions ?
Please refer to the [Backport tool
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Author: lcawl

docs/api/alerting/legacy/create.asciidoc

@@ -21,7 +21,7 @@ Create {kib} alerts.
 `space_id`::
   (Optional, string) An identifier for the space. If `space_id` is not provided in the URL, the default space is used.
 
-WARNING: As part of the {kibana-ref-all}/master/sharing-saved-objects.html[Sharing Saved Objects] effort, IDs for rules in a custom space will be regenerated in 8.0.0. Rules created prior to 8.0.0 using this API that specify both the `id` and `space_id` path parameters will be re-assigned a randomly generated ID upon upgrading to 8.0.0.
+WARNING: As part of the {kibana-ref-all}/8.0/sharing-saved-objects.html[Sharing Saved Objects] effort, IDs for rules in a custom space will be regenerated in 8.0.0. Rules created prior to 8.0.0 using this API that specify both the `id` and `space_id` path parameters will be re-assigned a randomly generated ID upon upgrading to 8.0.0.
 
 `id`::
   (Optional, string) Specifies a UUID v1 or v4 to use instead of a randomly generated ID.