Revert example prose

Author: jan-ivar

index.bs

@@ -7459,8 +7459,8 @@ readable and writable streams represent the two ends of a longer pipeline, with
 web developer code insert [=transform streams=] into the middle of them.
 
 <div class="example" id="example-endpoint-pair-usage">
- Assuming we had a web-platform-provided interface `Transformer` that had `readable` and
- `writable` attributes, web developers would write code like so:
+ Assuming we had a web-platform-provided function `createEndpointPair()`, web developers would write
+ code like so:
 
  <xmp highlight="js">
  const { readable, writable } = createEndpointPair();