Update defer-stream.mdx

Author: JoviDeCroock

website/pages/defer-stream.mdx

@@ -5,7 +5,7 @@ title: Enabling Defer & Stream
 import { Callout } from 'nextra/components'
 
 <Callout type="info" emoji="ℹ️">
-  These exports are only availble in v17 and beyond.
+  These exports are only available in v17 and beyond.
 </Callout>
 
 The `@defer` and `@stream` directives are not enabled by default.