docs: fix: put string literal within double quotes

[karuppiah7890]

Summary

Proposed change:

This PR fixes a bug / issue in the docs site. The bug / issue is in one of the exampels in the Templating section under replace section

Closes #1470

Checklist

I've completed the checklist below to ensure I didn't forget anything. This makes reviewing this PR as easy as possible for the maintainers. And it gets this change released as soon as possible.

• Proposed change helps towards purpose of this project.
• Documentation is added / updated to describe proposed change.
• Tests are added / updated to cover proposed change.
• Changelog has an entry for proposed change (if user-facing fix or feature).