Missing underline tag in "Styling text" section of basic-writing-and-formatting-syntax.md

[jhauga]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

Basic writing and formatting syntax page in the styling text section.

What part(s) of the article would you like to see updated?

• Add a row to underline text in the "Styling text" section.
• Underlining text is a common method of styling text.
• Demonstrate how to underline text in a markdown document using the <ins> </ins> tag.

Additional information

• Yes
• it works

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