Update sl-jdbc.md

[rpourzand]

I realized the examples in the jdbc api query table are missing single quotes! I added them

What are you changing in this pull request and why?

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):

• Remove page from website/sidebars.js
• Add an entry website/static/_redirects
• Ran link testing to update the links that point to the deleted page

[welcome]

Hello!👋 Thanks for contributing to the dbt product documentation and opening this pull request! ✨
We use Markdown and some HTML to write the dbt product documentation. When writing content, you can use our style guide and content types to understand our writing standards and how we organize information in the dbt product docs.
We'll review your contribution and respond as soon as we can. 😄

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[mirnawong1]

hey @rpourzand thanks for opening this up! i left some questions for other fields as they may not need apostrophes -- wanted to double check with you!

[mirnawong1]

hey @rpourzand , looks good! approving to merge ✨ ! thanks for opening this up!