Update pipeline label text in docs

doc/ci/pipelines/merge_request_pipelines.md

@@ -41,8 +41,10 @@ Both of these types of pipelines can appear on the **Pipelines** tab of a merge
 The three types of merge request pipelines are:
 
 - Merge request pipelines, which run on the changes in the merge request's
-  source branch. These pipelines display a `detached` label to indicate that the
+  source branch. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/352939)
+  in GitLab 14.9, these pipelines display a `merge request` label to indicate that the
   pipeline ran only on the contents of the source branch, ignoring the target branch.
+  In GitLab 14.8 and earlier, the label is `detached`.
 - [Merged results pipelines](merged_results_pipelines.md), which run on
   the result of combining the source branch's changes with the target branch.
 - [Merge trains](merge_trains.md), which run when merging multiple merge requests

doc/ci/pipelines/merged_results_pipelines.md

@@ -24,7 +24,7 @@ Merged results pipelines can't run when:
 - The merge request is a [**Draft** merge request](../../user/project/merge_requests/drafts.md).
 
 In these cases, the pipeline runs as a [merge request pipeline](merge_request_pipelines.md)
-and is labeled as `detached`.
+and [is labeled as `merge request`](merge_request_pipelines.md#types-of-merge-request-pipelines).
 
 ## Prerequisites