[BD-5531] Fix Liquid in example

[lydia-xie]

Why are you making this change? (required)

Fix Liquid in example

Related PRs, issues, or features (optional)

• BD-5531

Feature release date (optional)

• N/A

Contributor checklist

• I confirm that my PR meets the following:
  • I signed the Contribution License Agreement (CLA).
  • My style and voice follow the Braze Style Guide.
  • My content contains correct spelling and grammar.
  • All links are working correctly.
  • If I renamed or moved a file or directory, I set up URL redirects for each file.
  • If I updated or replaced an image, I did not remove the original image file from the repository. (For more information, see Updating an image).
  • If my PR is related to a paid SKU, third party, SMS, AI, or privacy, I have received written approval from Braze Legal.

Submitting for review

If your PR meets the above requirements, select Ready for review, then add a reviewer:

• Non-Braze contributors: Tag @braze-inc/docs-team in a comment below.
• Braze employees: Have any relevant subject matter experts (like engineers or product managers) review your work first, then add the tech writer assigned to your specific vertical. If you're not sure which tech writer to add, you can add braze-inc/docs-team instead.

Thanks for contributing! We look forward to reading your work.

Fixes #11473

[Copilot]

Pull request overview

This pull request corrects Liquid syntax in documentation examples by replacing the invalid && operator with the proper and operator, along with several minor grammar improvements.

Key Changes:

• Corrects Liquid operator syntax from && to and in conditional statements (lines 117, 148)
• Updates operator description in instructional text to use proper Liquid terminology
• Fixes minor grammar issues (subject-verb agreement, article usage, punctuation)

[rachel-feinberg]

LGTM