Include a functional example in GraphQL docs

doc/api/graphql/index.md

@@ -14,7 +14,15 @@ For those new to the GitLab GraphQL API, see
 - Get an [introduction to GraphQL from graphql.org](https://graphql.org/).
 - GitLab supports a wide range of resources, listed in the [GraphQL API Reference](reference/index.md).
 
-#### GraphiQL
+### Examples
+
+To work with sample queries that pull data from public projects on GitLab.com,
+see the menu options in the left-hand
+documentation menu, under API > GraphQL at `https://docs.gitlab.com/ee/api/graphql/`.
+
+The [Getting started](getting_started.md) page includes different methods to customize GraphQL queries.
+
+### GraphiQL
 
 Explore the GraphQL API using the interactive [GraphiQL explorer](https://gitlab.com/-/graphql-explorer),
 or on your self-managed GitLab instance on

doc/api/graphql/sample_issue_boards.md

+# Identify issue boards with GraphQL
+
+This page describes how you can use the GraphiQL explorer to identify
+existing issue boards in the `gitlab-docs` documentation repository.
+
+## Set up the GraphiQL explorer
+
+This procedure presents a substantive example that you can copy and paste into your own
+instance of the [GraphiQL explorer](https://gitlab.com/-/graphql-explorer):
+
+1. Copy the following code excerpt:
+
+   ```graphql
+   query {
+     project(fullPath: "gitlab-org/gitlab-docs") {
+       name
+       forksCount
+       statistics {
+         wikiSize
+       }
+       issuesEnabled
+       boards {
+         nodes {
+           id
+           name
+         }
+       }
+     }
+   }
+   ```
+
+1. Open the [GraphiQL Explorer](https://gitlab.com/-/graphql-explorer) page.
+1. Paste the `query` listed above into the left window of your GraphiQL explorer tool.
+1. Click Play to get the result shown here:
+
+![GraphiQL explorer search for boards](img/sample_issue_boards_v13_2.png)
+
+If you want to view one of these boards, take one of the numeric identifiers shown in the output. From the screenshot, the first identifier is `105011`. Navigate to the following URL, which includes the identifier:
+
+```markdown
+https://gitlab.com/gitlab-org/gitlab-docs/-/boards/105011
+```
+
+For more information on each attribute, see the [GraphQL API Resources](reference/index.md).