Add Merge Request link to the v3 to v4 documentation

Similar to changelog, mention the Merge Request id & link for each
change.

doc/api/v3_to_v4.md

@@ -6,18 +6,18 @@ changes are in V4:
 
 ### 8.17
 
-- Removed `/projects/:search` (use: `/projects?search=x`)
-- `iid` filter has been removed from `projects/:id/issues`
-- `projects/:id/merge_requests?iid[]=x&iid[]=y` array filter has been renamed to `iids`
-- Endpoints under `projects/merge_request/:id` have been removed (use: `projects/merge_requests/:id`)
-- Project snippets do not return deprecated field `expires_at`
-- Endpoints under `projects/:id/keys` have been removed (use `projects/:id/deploy_keys`)
+- Removed `/projects/:search` (use: `/projects?search=x`) [!8877](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8877)
+- `iid` filter has been removed from `projects/:id/issues` [!8967](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8967)
+- `projects/:id/merge_requests?iid[]=x&iid[]=y` array filter has been renamed to `iids` [!8793](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8793)
+- Endpoints under `projects/merge_request/:id` have been removed (use: `projects/merge_requests/:id`) [!8793](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8793)
+- Project snippets do not return deprecated field `expires_at` [!8723](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8723)
+- Endpoints under `projects/:id/keys` have been removed (use `projects/:id/deploy_keys`) [!8716](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8716)
 
 ### 9.0
 
-- Status 409 returned for POST `project/:id/members` when a member already exists
-- Moved `DELETE /projects/:id/star` to `POST /projects/:id/unstar`
-- Removed the following deprecated Templates endpoints (these are still accessible with `/templates` prefix)
+- Status 409 returned for POST `project/:id/members` when a member already exists [!9093](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9093)
+- Moved `DELETE /projects/:id/star` to `POST /projects/:id/unstar` [!9328](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9328)
+- Removed the following deprecated Templates endpoints (these are still accessible with `/templates` prefix) [!8853](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8853)
   - `/licences`
   - `/licences/:key`
   - `/gitignores`
@@ -26,17 +26,17 @@ changes are in V4:
   - `/gitignores/:key`
   - `/gitlab_ci_ymls/:key`
   - `/dockerfiles/:key`
-- Moved `/projects/fork/:id` to `/projects/:id/fork`
-- Moved `DELETE /todos` to `POST /todos/mark_as_done` and `DELETE /todos/:todo_id` to `POST /todos/:todo_id/mark_as_done`
-- Endpoints `/projects/owned`, `/projects/visible`, `/projects/starred` & `/projects/all` are consolidated into `/projects` using query parameters
-- Return pagination headers for all endpoints that return an array
-- Removed `DELETE projects/:id/deploy_keys/:key_id/disable`. Use `DELETE projects/:id/deploy_keys/:key_id` instead
-- Moved `PUT /users/:id/(block|unblock)` to `POST /users/:id/(block|unblock)`
-- Make subscription API more RESTful. Use `post ":project_id/:subscribable_type/:subscribable_id/subscribe"` to subscribe and `post ":project_id/:subscribable_type/:subscribable_id/unsubscribe"` to unsubscribe from a resource.
-- Labels filter on `projects/:id/issues` and `/issues` now matches only issues containing all labels (i.e.: Logical AND, not OR)
-- Renamed param `branch_name` to `branch` on the following endpoints
+- Moved `/projects/fork/:id` to `/projects/:id/fork` [!8940](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8940)
+- Moved `DELETE /todos` to `POST /todos/mark_as_done` and `DELETE /todos/:todo_id` to `POST /todos/:todo_id/mark_as_done` [!9410](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9410)
+- Endpoints `/projects/owned`, `/projects/visible`, `/projects/starred` & `/projects/all` are consolidated into `/projects` using query parameters [!8962](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8962)
+- Return pagination headers for all endpoints that return an array [!8606](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8606)
+- Removed `DELETE projects/:id/deploy_keys/:key_id/disable`. Use `DELETE projects/:id/deploy_keys/:key_id` instead [!9366](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9366)
+- Moved `PUT /users/:id/(block|unblock)` to `POST /users/:id/(block|unblock)` [!9371](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9371)
+- Make subscription API more RESTful. Use `post ":project_id/:subscribable_type/:subscribable_id/subscribe"` to subscribe and `post ":project_id/:subscribable_type/:subscribable_id/unsubscribe"` to unsubscribe from a resource. [!9325](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9325)
+- Labels filter on `projects/:id/issues` and `/issues` now matches only issues containing all labels (i.e.: Logical AND, not OR) [!8849](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8849)
+- Renamed param `branch_name` to `branch` on the following endpoints [!8936](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8936)
   - POST `:id/repository/branches`
   - POST `:id/repository/commits`
   - POST/PUT/DELETE `:id/repository/files`
-- Renamed `branch_name` to `branch` on DELETE `id/repository/branches/:branch` response
-
+- Renamed `branch_name` to `branch` on DELETE `id/repository/branches/:branch` response [!8936](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8936)
+- Remove `public` param from create and edit actions of projects [!8736](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8736)