Clean up entries in root NOTICE for content are deleted from the repo already (#11132)

Author: curtisman

NOTICE.md

@@ -2,48 +2,6 @@
 
 This repository incorporates material as listed below or described in the code.
 
-## Project Gutenberg's Adventures of Huckleberry Finn, Complete by Mark Twain (Samuel Clemens)
-
-### License
-
-This eBook is for the use of anyone anywhere at no cost and with
-almost no restrictions whatsoever. You may copy it, give it away or
-re-use it under the terms of the Project Gutenberg License included
-with this eBook or online at www.gutenberg.org
-
-## Project Gutenberg's Alice's Adventures in Wonderland, by Lewis Carroll
-
-### License
-
-This eBook is for the use of anyone anywhere at no cost and with
-almost no restrictions whatsoever. You may copy it, give it away or
-re-use it under the terms of the Project Gutenberg License included
-with this eBook or online at www.gutenberg.org
-
-## Project Gutenberg's Ulysses, by James Joyce
-
-### License
-
-This eBook is for the use of anyone anywhere at no cost and with
-almost no restrictions whatsoever. You may copy it, give it away or
-re-use it under the terms of the Project Gutenberg License included
-with this eBook or online at www.gutenberg.org
-
-## Project Gutenberg's The Adventures of Tom Sawyer, Complete by Mark Twain (Samuel Clemens)
-
-### License
-
-This eBook is for the use of anyone anywhere at no cost and with
-almost no restrictions whatsoever. You may copy it, give it away or
-re-use it under the terms of the Project Gutenberg License included
-with this eBook or online at www.gutenberg.org
-
-## Fairy Tales, by the Grimm Brothers
-
-### License
-
-Public domain.
-
 ## Pride and Prejudice, by the Grimm Brothers
 
 ### License