Link to rendered OpenAPI file

doc/api/openapi/openapi_interactive.md

@@ -10,19 +10,27 @@ Introduces the interactive documentation tool for the GitLab API.
 
 ## About the OpenAPI specification
 
-The [OpenAPI specification](https://swagger.io/specification/) (formerly called Swagger) defines a standard, language-agnostic interface to RESTful APIs. OpenAPI definition files are written in the YAML format, which is automatically rendered by the GitLab browser into a more human-readable interface. For general information about the GitLab APIs, see [API Docs](../README.md).
+The [OpenAPI specification](https://swagger.io/specification/) (formerly called Swagger) defines a
+standard, language-agnostic interface to RESTful APIs. OpenAPI definition files are written in the
+YAML format, which is automatically rendered by the GitLab browser into a more human-readable interface.
+
+For general information about the GitLab APIs, see [API Docs](../README.md).
 
 ## Overview
 
-The [interactive API documentation tool](openapi.yaml) allows API testing directly on the GitLab.com
-website. Only a few of the available endpoints are documented with the OpenAPI spec, but the current
-list demonstrates the functionality of the tool.
+<!--
+The following link is absolute rather than relative because it needs to be viewed through the GitLab
+Open API file viewer: https://docs.gitlab.com/ee/user/project/repository/index.html#openapi-viewer.
+-->
+The [interactive API documentation tool](https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/api/openapi/openapi.yaml)
+allows API testing directly on the GitLab.com website. Only a few of the available endpoints are
+documented with the OpenAPI spec, but the current list demonstrates the functionality of the tool.
 
 ![API viewer screenshot](img/apiviewer01-fs8.png)
 
 ## Endpoint parameters
 
-When you expand an endpoint listing, you'll see a description, input parameters (if required),
+When you expand an endpoint listing, you see a description, input parameters (if required),
 and example server responses. Some parameters include a default or a list of allowed values.
 
 ![API viewer screenshot](img/apiviewer04-fs8.png)