Update dev guide for benchmarks

[MiguelWeezardo]

Description

Is this change a fix, improvement, new feature, refactoring, or other?

Is this a change to the core query engine, a connector, client library, or the SPI interfaces? (be specific)

How would you describe this change to a non-technical end user or system administrator?

Related issues, pull requests, and links

Documentation

( ) No documentation is needed. ( ) Sufficient documentation is included in this PR. ( ) Documentation PR is available with #prnumber. ( ) Documentation issue #issuenumber is filed, and can be handled later.

Release notes

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# Section
* Fix some things. ({issue}`issuenumber`)