Remove approve in External Status Checks API docs

To avoid confusion with Merge Request approvals, and to maintain a
distinction between the value of human and bot judgments, we do not
use the term "approve" or "approval" in relation to External Status
Checks. This updates the API documentation to remove the term from
a few locations, because it was briefly in use.

doc/api/status_checks.md

@@ -42,9 +42,9 @@ GET /projects/:id/merge_requests/:merge_request_iid/status_checks
 ]
 ```
 
-## Set approval status of an external status check
+## Set status of an external status check
 
-For a single merge request, use the API to inform GitLab that a merge request has been approved by an external service.
+For a single merge request, use the API to inform GitLab that a merge request has passed a check by an external service.
 
 ```plaintext
 POST /projects/:id/merge_requests/:merge_request_iid/status_check_responses

doc/user/project/merge_requests/status_checks.md

@@ -125,7 +125,7 @@ the status checks as `pending`:
 
 ![Status checks widget pending](img/status_checks_widget_pending_v14_0.png)
 
-After GitLab [receives a response](../../../api/status_checks.md#set-approval-status-of-an-external-status-check)
+After GitLab [receives a response](../../../api/status_checks.md#set-status-of-an-external-status-check)
 from the external status check, the widget updates accordingly.
 
 NOTE: