Fix relative link for linkinator

https://github.com/nodejs/nodejs.org/pull/3410/checks?check_run_id=1951382231

Author: pzrq

locale/en/docs/guides/simple-profiling.md

@@ -280,4 +280,4 @@ You may also find [how to create a flame graph][diagnostics flamegraph] helpful.
 
 [profiler inside V8]: https://v8.dev/docs/profile
 [benefits of asynchronous programming]: https://nodesource.com/blog/why-asynchronous
-[diagnostics flamegraph]: ./diagnostics-flamegraph/
+[diagnostics flamegraph]: ../diagnostics-flamegraph/