chore: correct tabs examples in documentation

[nicholasrice]

Description

Tabs documentation was using a lightweight anchor style in a list of anchors, resulting in a mismatch in visual alignment between list item indicators and the anchor itself. This happens because the lightweight style isn't intended to be used inline in text. This PR replaces the lightweight style with a hypertext style, which is intended to be used inline.

closes #3816

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.