Instructions to generate speedscope profiles using py-spy (#5814)

[Preview](https://docs-getdbt-com-git-dbeatty10-patch-2-dbt-labs.vercel.app/reference/global-configs/record-timing-info)

## What are you changing in this pull request and why?
Officially documenting the performance profiling approach mentioned in
dbt-labs/dbt-core#10434 (comment).

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.

website/docs/reference/global-configs/record-timing-info.md

@@ -15,3 +15,10 @@ $ snakeviz timing.txt
 ```
 
 </File>
+
+Alternatively, you can use [`py-spy`](https://github.com/benfred/py-spy) to collect [speedscope](https://github.com/jlfwong/speedscope) profiles of dbt commands like this:
+
+```shell
+python -m pip install py-spy
+sudo py-spy record -s -f speedscope -- dbt parse
+```