Updated wording in doc/api/merge_requests.md response notes

Signed-off-by: Raimund Hook <raimund.hook@exfo.com>

doc/api/merge_requests.md

@@ -775,8 +775,8 @@ the `approvals_before_merge` parameter:
 ### Single merge request response notes
 
 - The `merge_status` field may hold one of the following values:
-  - `unchecked`: We have not checked this yet.
-  - `checking`: We are currently checking if the merge request can be merged.
+  - `unchecked`: This merge request has not yet been checked.
+  - `checking`: This merge request is currently being checked to see if it can be merged.
   - `can_be_merged`: This merge request can be merged without conflict.
   - `cannot_be_merged`: There are merge conflicts between the source and target branches.
   - `cannot_be_merged_recheck`: Currently unchecked. Before the current changes, there were conflicts.