Docs: Link for `@defer` directive (and others) points to intern

In the most recent Glossary page in the docs, the _"See the documentation"_ link for [@defer](https://relay.dev/docs/glossary/#defer) points to the wiki: https://www.internalfb.com/intern/wiki/Relay/Web/incremental-data-delivery-defer-stream/#defer

It'd be helpful to get some more information about how the directive works into the public docs.

---

There are other links to intern in the docs, though it looks like a few of them are intentional—it may be worth auditing this list to see if they should be changed. If not, I can open a PR updating the docs to at least indicate them as FB-only.
```
docs % grep -R '/intern/' .
./api-reference/hooks/use-query-loader.md: * `fetchPolicy`: _*[Optional]*_ Determines if cached data should be used, and when to send a network request based on the cached data that is currently available in the Relay store (for more details, see our [Fetch Policies](https://www.internalfb.com/intern/wiki/Relay/guided-tour-of-relay/reusing-cached-data-for-rendering/#fetch-policies) and [Garbage Collection](https://www.internalfb.com/intern/wiki/Relay/guided-tour-of-relay/reusing-cached-data-for-rendering/#garbage-collection-in-re) guides):
./api-reference/entrypoint-apis/use-entrypoint-loader.md:For more information, see the [Loading EntryPoints](https://www.internalfb.com/intern/wiki/Relay/Guides/entry-points/#loading-entrypoints) guide.
./guided-tour/introduction.md:* [Javascript](https://our.internmc.facebook.com/intern/wiki/JavaScript/)
./guided-tour/introduction.md:* [React](https://our.internmc.facebook.com/intern/wiki/ReactGuide/)
./guided-tour/introduction.md:* [GraphQL](https://our.internmc.facebook.com/intern/wiki/GraphQL/) and our internal [GraphQL Server](https://our.internmc.facebook.com/intern/wiki/Graphql-for-hack-developers/)
./guided-tour/updating-data/graphql-mutations.md:* Check out the [Hack documentation on writing mutations](https://www.internalfb.com/intern/wiki/Graphql-for-hack-developers/mutation-root-fields/) for information on how to add a mutation field to your back-end code.
./guided-tour/updating-data/graphql-subscriptions.md:[GraphQL Subscriptions](https://our.internmc.facebook.com/intern/wiki/GraphQL_Subscriptions/) (GQLS) are a mechanism which allow clients to subscribe to changes in a piece of data from the server, and get notified whenever that data changes.
./guided-tour/updating-data/graphql-subscriptions.md:At Facebook, the Network Layer has already been configured to handle GraphQL Subscriptions. For more details on writing subscriptions at Facebook, check out this [guide](../../../guides/writing-subscriptions/). For a guide on setting up subscriptions on the server side, check out this [wiki](https://our.internmc.facebook.com/intern/wiki/GraphQL_Subscriptions/creating-a-new-subscription/).
./guides/testing-relay-with-preloaded-queries.md:* [D23078476](https://internalfb.com/intern/diff/D23078476)
./glossary/glossary.md:A field implementing the connection spec. See here for more details on the spec, and the section of the guided tour on rendering list data and pagination.
./glossary/glossary.md:See the [documentation](https://www.internalfb.com/intern/wiki/Relay/Web/incremental-data-delivery-defer-stream/#defer).
./glossary/glossary.md:See the [documentation](https://www.internalfb.com/intern/wiki/Relay/Debugging_Guides/Relay_DevTools_Guide_For_Users/).
./glossary/glossary.md:See more information in the [guided tour](https://www.internalfb.com/intern/wiki/Relay/guided-tour-of-relay/reusing-cached-data-for-rendering/#garbage-collection-in-re).
./glossary/glossary.md:See the [section in the guide](https://www.internalfb.com/intern/wiki/Relay/guided-tour-of-relay/updating-data/#invalidating-data-during).
./glossary/glossary.md:See the [guide on mutations](../guided-tour/updating-data/graphql-mutations), and [this article](https://www.internalfb.com/intern/wiki/Graphql-for-hack-developers/mutation-root-fields/) on defining mutations in your hack code.
./glossary/glossary.md:Projects are defined in a single [config](#config) file, found [here](https://www.internalfb.com/intern/diffusion/WWW/browse/master/scripts/relay/compiler-rs/config.www.json) and [here](https://www.internalfb.com/intern/diffusion/FBS/browse/master/xplat/relay/compiler-rs/config.xplat.json).
./glossary/glossary.md:For more info, look [here](https://www.internalfb.com/intern/wiki/GraphQL/Build_Infra/Schema_Sync/) and [here](https://www.internalfb.com/intern/wiki/Relay-team/GraphQL_Schema_Sync/).
```