The Tour has very limited real estate for us to modify - it is only the words above "We're a little bit different from other sites. Here's how:" that can be changed.
Instead of trying to include reference to coding style guides there, I think the best place to do that is in the Meta GIS Q&A about Writing code snippets to get quicker answers?
As a result of your question I have added the additional words to my answer there about writing code snippets for ArcPy questions:
Sometimes a person's coding style can be off-putting to a potential answerer who is deciding whether to volunteer their time to try and understand a question before trying to answer it.
One way to improve readability of Python/ArcPy code is to try and conform to PEP 8 -- Style Guide for Python Code.
I would like to encourage you, or anyone with the necessary SQL skills, to write an answer there about writing SQL expressions for quicker answers, and to include in that a reference to how conforming to the SQL Style Guide can help.