Remove outdated version refs from MR API

doc/api/merge_requests.md

 ---
 stage: Create
 group: Code Review
-info: "To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments"
-type: reference, api
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
 # Merge requests API **(FREE)**
 
-> - `author_id`, `author_username`, and `assignee_id` were [introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13060) in GitLab 9.5.
-> - `my_reaction_emoji` was [introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/14016) in GitLab 10.0.
-> - For the `scope` attribute, `created-by-me` and `assigned-to-me` were [deprecated](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/18935) in favor of `created_by_me` and `assigned_to_me` in GitLab 11.0.
 > - `with_labels_details` was [introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/21413) in GitLab 12.7.
 > - `author_username` and `author_username` were [introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13060) in GitLab 12.10.
 > - `reference` was [deprecated](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/20354) in GitLab 12.10 in favour of `references`.
@@ -52,8 +48,6 @@ still apply.
 
 ## List merge requests
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13060) in GitLab 9.5.
-
 Get all merge requests the authenticated user has access to. By
 default it returns only merge requests created by the current user. To
 get all merge requests, use parameter `scope=all`.
@@ -467,14 +461,14 @@ Parameters:
 | `updated_after`                 | datetime       | no       | Return merge requests updated on or after the given time. Expected in ISO 8601 format (`2019-03-15T08:00:00Z`). |
 | `updated_before`                | datetime       | no       | Return merge requests updated on or before the given time. Expected in ISO 8601 format (`2019-03-15T08:00:00Z`). |
 | `scope`                         | string         | no       | Return merge requests for the given scope: `created_by_me`, `assigned_to_me` or `all`.                                     |
-| `author_id`                     | integer        | no       | Returns merge requests created by the given user `id`. Mutually exclusive with `author_username`. _([Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13060) in GitLab 9.5)_. |
+| `author_id`                     | integer        | no       | Returns merge requests created by the given user `id`. Mutually exclusive with `author_username`. |
 | `author_username`               | string         | no       | Returns merge requests created by the given `username`. Mutually exclusive with `author_id`. _([Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13060) in GitLab 12.10)_. |
-| `assignee_id`                   | integer        | no       | Returns merge requests assigned to the given user `id`. `None` returns unassigned merge requests. `Any` returns merge requests with an assignee. _([Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13060) in GitLab 9.5)_. |
+| `assignee_id`                   | integer        | no       | Returns merge requests assigned to the given user `id`. `None` returns unassigned merge requests. `Any` returns merge requests with an assignee. |
 | `approver_ids` **(PREMIUM)**    | integer array  | no       | Returns merge requests which have specified all the users with the given `id`s as individual approvers. `None` returns merge requests without approvers. `Any` returns merge requests with an approver. |
 | `approved_by_ids` **(PREMIUM)** | integer array  | no       | Returns merge requests which have been approved by all the users with the given `id`s (Max: 5). `None` returns merge requests with no approvals. `Any` returns merge requests with an approval. |
 | `reviewer_id`                   | integer        | no       | Returns merge requests which have the user as a [reviewer](../user/project/merge_requests/getting_started.md#reviewer) with the given user `id`. `None` returns merge requests with no reviewers. `Any` returns merge requests with any reviewer. Mutually exclusive with `reviewer_username`.  |
 | `reviewer_username`             | string         | no       | Returns merge requests which have the user as a [reviewer](../user/project/merge_requests/getting_started.md#reviewer) with the given `username`. `None` returns merge requests with no reviewers. `Any` returns merge requests with any reviewer. Mutually exclusive with `reviewer_id`. |
-| `my_reaction_emoji`             | string         | no       | Return merge requests reacted by the authenticated user by the given `emoji`. `None` returns issues not given a reaction. `Any` returns issues given at least one reaction. _([Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/14016) in GitLab 10.0)_. |
+| `my_reaction_emoji`             | string         | no       | Return merge requests reacted by the authenticated user by the given `emoji`. `None` returns issues not given a reaction. `Any` returns issues given at least one reaction. |
 | `source_branch`                 | string         | no       | Return merge requests with the given source branch.                                                                             |
 | `target_branch`                 | string         | no       | Return merge requests with the given target branch.                                                                             |
 | `search`                        | string         | no       | Search merge requests against their `title` and `description`. |
@@ -976,8 +970,6 @@ Parameters:
 
 ## List MR pipelines
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/15454) in GitLab 10.5.
-
 Get a list of merge request pipelines.
 
 ```plaintext