doc: unify format of iterables

Also, make signatures easier for copy-paste testing.

PR-URL: #20036
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/stream.md

@@ -1206,16 +1206,14 @@ myReader.on('readable', () => {
 });
 ```
 
-##### readable[@@asyncIterator]
+##### readable\[Symbol.asyncIterator\]()
 <!-- YAML
 added: REPLACEME
 -->
 
 > Stability: 1 - Experimental
 
-* {AsyncIterator}
-
-Returns an [AsyncIterator][async-iterator] to fully consume the stream.
+* Returns: {AsyncIterator} to fully consume the stream.
 
 ```js
 const fs = require('fs');
@@ -2415,4 +2413,3 @@ contain multi-byte characters.
 [readable-destroy]: #stream_readable_destroy_error
 [writable-_destroy]: #stream_writable_destroy_err_callback
 [writable-destroy]: #stream_writable_destroy_error
-[async-iterator]: https://github.com/tc39/proposal-async-iteration

doc/api/url.md

@@ -736,7 +736,7 @@ percent-encoded where necessary.
 
 Returns an ES6 Iterator over the values of each name-value pair.
 
-#### urlSearchParams\[@@iterator\]()
+#### urlSearchParams\[Symbol.iterator\]()
 
 * Returns: {Iterator}
 
@@ -1174,7 +1174,7 @@ console.log(myURL.origin);
 [`url.toJSON()`]: #url_url_tojson
 [`url.toString()`]: #url_url_tostring
 [`urlSearchParams.entries()`]: #url_urlsearchparams_entries
-[`urlSearchParams@@iterator()`]: #url_urlsearchparams_iterator
+[`urlSearchParams@@iterator()`]: #url_urlsearchparams_symbol_iterator
 [ICU]: intl.html#intl_options_for_building_node_js
 [Punycode]: https://tools.ietf.org/html/rfc5891#section-4.4
 [WHATWG URL Standard]: https://url.spec.whatwg.org/