[7.14] [DOCS] Fix URL in alerting API (#209594) (#209616)

# Backport

This will backport the following commits from `7.17` to `7.14`:
- [[DOCS] Fix URL in alerting API
(#209594)](#209594)

NOTE: Since the target page doesn't exist in this branch, I've linked to
8.0. I used that branch instead of current, since "current" will change
again in the near future and seems like it is less likely to be helpful
than pointing to one of the 8.x branches.

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

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

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Fix URL in alerting API
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Fix URL in alerting
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Fix URL in alerting API
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BACKPORT-->

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.