Fix the Description Paragraph for NIST Public Domain Notice with license fallback

[fairfield-programming-bot]

Hey!

When we first started the Openlist, we added all of the licenses we could find. Our problem? Most don't have great descriptions. If you want to change the description for the NIST Public Domain Notice with license fallback, you can comment below and we will assign the issue to you.

Thank you,
The FPA

P.S. here's the location of the NIST Public Domain Notice with license fallback.