feat(Link): Clarify link behavior

It was noted that more clarification around the default link behavior would be helpful as reference, so it has been added in this MR.

References:

• https://www.w3.org/TR/WCAG20-TECHS/G201.html
• https://www.digitala11y.com/external-links-in-or-out/
• https://adrianroselli.com/2020/02/link-targets-and-3-2-5.html