docs(server-renderer): fix typo in renderToWebStream error, and remove Cloudflare Worker reference (#4249) [ci skip]

Author: Cherry

packages/server-renderer/README.md

@@ -88,7 +88,7 @@ function renderToWebStream(
 **Usage**
 
 ```js
-// e.g. inside a Cloudflare Worker
+// e.g. inside an environment with ReadableStream support
 return new Response(renderToWebStream(app))
 ```
 

packages/server-renderer/src/renderToStream.ts

@@ -129,7 +129,7 @@ export function renderToWebStream(
 ): ReadableStream {
   if (!Ctor && !hasGlobalWebStream) {
     throw new Error(
-      `ReadableStream constructor is not avaialbe in the global scope and ` +
+      `ReadableStream constructor is not available in the global scope and ` +
         `must be explicitly passed in as the 3rd argument:\n\n` +
         `  import { ReadableStream } from 'stream/web'\n` +
         `  const stream = renderToWebStream(app, {}, ReadableStream)`