fix: inherit font size and line height in hypertext styles

[chrisdholt]

Description

The intent of the hypertext styling on fast-anchor is that it be used inline with other text. This change updates the styles to better align with that intent by inheriting line height and font-size. If a user needs a similar solution for a non-inline scenario they can use the lightweight appearance of fast-anchor where the font size is set to align with other button appearances.

Motivation & context

Issue type checklist

• Chore: A change that does not impact distributed packages.
• Bug fix: A change that fixes an issue, link to the issue above.
• New feature: A change that adds functionality.

Is this a breaking change?

• This change causes current functionality to break.

Adding or modifying component(s) in @microsoft/fast-components checklist

• I have added a new component
• I have modified an existing component
• I have updated the definition file
• I have updated the configuration file

Process & policy checklist

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

[EisenbergEffect]

Makes total sense.