doc: fix links in test/common/README.md

PR-URL: nodejs#25172
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/common/README.md

@@ -271,8 +271,8 @@ See `common.expectWarning()` for usage.
 Indicates whether 'opensslCli' is supported.
 
 ### platformTimeout(ms)
-* `ms` [<number>|<bigint>]
-* return [<number>|<bigint>]
+* `ms` [<number>] | [<bigint>]
+* return [<number>] | [<bigint>]
 
 Returns a timeout value based on detected conditions. For example, a debug build
 may need extra time so the returned value will be larger than on a release
@@ -793,11 +793,12 @@ See [the WPT tests README][] for details.
 [<Function>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function
 [<Object>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object
 [<RegExp>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
+[<bigint>]: https://github.com/tc39/proposal-bigint
 [<boolean>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type
 [<number>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type
 [<string>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type
+[Web Platform Tests]: https://github.com/web-platform-tests/wpt
 [`hijackstdio.hijackStdErr()`]: #hijackstderrlistener
 [`hijackstdio.hijackStdOut()`]: #hijackstdoutlistener
 [internationalization]: https://github.com/nodejs/node/wiki/Intl
-[Web Platform Tests]: https://github.com/web-platform-tests/wpt
 [the WPT tests README]: ../wpt/README.md