Fix the Description for NIST Public Domain Notice

[fairfield-programming-bot]

Howdy,

When we first started the Openlist, we added hundreds of licenses. But, most don't have great descriptions. So, if you would like to write a better description for the NIST Public Domain Notice, please leave a comment below and we will assign the issue to you. The best way to write a description is to do a bit of research on the history of the license. Also, if you need any help writing the description or have any questions, please let us know.

Our Gratitude,
The FPA

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