Qualify the words LTS and Maintenance

[bmuenzenmeyer]

A review of #7962 revealed a small opportunity.
Relates to #7965

https://nodejs.org/en/about/previous-releases

Makes these lifecycle

Current ➡️ Active ➡️ Maintenance

https://nodejs.org/en/about/previous-releases#looking-for-the-latest-release-of-a-version-branch

Yet, the table labels ACTIVE as LTS, when LTS is two different phases, according to our own docs.

Can we explore how to make this clearer in the table?

Suggestion:

Qualify the words LTS and Maintenance to match the first paragraph of the page

Note, color is handled by #7965