doc: update code example for Windows in stream.md

PR-URL: #13138
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/stream.md

@@ -134,7 +134,7 @@ const server = http.createServer( (req, res) => {
       res.write(typeof data);
       res.end();
     } catch (er) {
-      // uh oh!  bad json!
+      // uh oh! bad json!
       res.statusCode = 400;
       return res.end(`error: ${er.message}`);
     }
@@ -143,12 +143,12 @@ const server = http.createServer( (req, res) => {
 
 server.listen(1337);
 
-// $ curl localhost:1337 -d '{}'
+// $ curl localhost:1337 -d "{}"
 // object
-// $ curl localhost:1337 -d '"foo"'
+// $ curl localhost:1337 -d "\"foo\""
 // string
-// $ curl localhost:1337 -d 'not json'
-// error: Unexpected token o
+// $ curl localhost:1337 -d "not json"
+// error: Unexpected token o in JSON at position 1
 ```
 
 [Writable][] streams (such as `res` in the example) expose methods such as