Removes redunant variables from code blocks in add-w-and-b-to-your-code.md

[SinaMostafanejad]

{Description of the change}

This PR:

• removes the unused run variables from the code blocks, and
• fixes a minor typo ("," -> ":") in one of the code blocks

[mdlinville]

LGTM, just a few tiny nits, but I will go ahead and approve so that you can enable auto-merge. Thanks for your patience!

[SinaMostafanejad]

Thank you @mdlinville for the help. The CLI panel and the rest of the page also need a heavy revision too. That maybe better saved for another time, a separate PR and a cleaner chain of discussion.