Add link to connectors to federation directives reference.

[lennyburdette]

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Configuration

```json { "repoOverrides": { "apollographql/federation@main": { "remote": { "owner": "apollographql", "repo": "federation", "branch": "lb/connector-directives-reference" } } } } ```

Name	Link
Commit	87f1f648d0bba96f61db2ca80aef3283b5ce7173
Preview	[https://www.apollographql.com/docs/deploy-preview/f57ce5794c61d75cd751](https://www.apollographql.com/docs/deploy-preview/f57ce5794c61d75cd751)
Build ID	f57ce5794c61d75cd751
File Changes	0 new, 2 changed, 0 removed ``` * graphos/reference/federation/versions.mdx * graphos/reference/federation/directives.mdx ```
Pages	2

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