Apply suggestion from @vados-cosmonic

Co-authored-by: Victor Adossi <123968127+vados-cosmonic@users.noreply.github.com>

Author: ericgregory

component-model/src/design/async.md

@@ -35,7 +35,7 @@ A WIT function declared `async` tells the runtime that the call may suspend befo
 
 Code generated from the WIT picks up each language's natural async idiom: `async fn` in Rust, a `Promise`-returning function in JavaScript, a coroutine in Python.
 
-### `stream<T>`
+### Streams (`stream<T>`)
 
 A typed, asynchronous channel for a sequence of `T` values. Crucially, `stream<T>` is a Canonical ABI *value*, not a resource: it can be returned from a call, accepted as a parameter, and handed from one component to another without giving up ownership of the underlying buffer. The same value can also be passed straight through a middle component without that component having to relay any wake-ups.