Fix tag_pair's html_tag param name

What does this MR do and why?

A small fix for the tag_pair's html_tag documentation.

Screenshots or screen recordings

Before	After

How to set up and validate locally

N/A

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.