Fixes broken link to Relay "Getting Started Guide" in "Suspense for Data Fetching (Experimental)" (#3963)

Author: mattxwang

content/docs/concurrent-mode-suspense.md

@@ -100,7 +100,7 @@ function ProfileTimeline() {
 
 This demo is a teaser. Don't worry if it doesn't quite make sense yet. We'll talk more about how it works below. Keep in mind that Suspense is more of a *mechanism*, and particular APIs like `fetchProfileData()` or `resource.posts.read()` in the above example are not very important. If you're curious, you can find their definitions right in the [demo sandbox](https://codesandbox.io/s/frosty-hermann-bztrp).
 
-Suspense is not a data fetching library. It's a **mechanism for data fetching libraries** to communicate to React that *the data a component is reading is not ready yet*. React can then wait for it to be ready and update the UI. At Facebook, we use Relay and its [new Suspense integration](docs/getting-started/step-by-step-guide/). We expect that other libraries like Apollo can provide similar integrations.
+Suspense is not a data fetching library. It's a **mechanism for data fetching libraries** to communicate to React that *the data a component is reading is not ready yet*. React can then wait for it to be ready and update the UI. At Facebook, we use Relay and its [new Suspense integration](https://relay.dev/docs/getting-started/step-by-step-guide/). We expect that other libraries like Apollo can provide similar integrations.
 
 In the long term, we intend Suspense to become the primary way to read asynchronous data from components -- no matter where that data is coming from.