update licensing info for examples, tutorials

Author: lee2sman

docs/copyleft.md

@@ -2,11 +2,13 @@ The L5 library is free software; you can redistribute it and/or modify it under
 
 L5 is inspired by and based on the Processing family of languages, maintained by the [Processing Foundation](https://processingfoundation.org/), and is an independent community-maintained project.
 
-This website uses the MIT license, with the exception of the Reference and Examples pages, which are adapted from Processing and licensed under CC BY-NC-SA 4.0. 
+This website uses the MIT license, with the exception of pages listing other licenses. Reference pages contain content adapted from p5.js and Processing by [p5.js Contributors](https://github.com/processing/p5.js?tab=readme-ov-file#contributors) and [Processing Foundation](https://processingfoundation.org/people), licensed under [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/). 
+
+Tutorial pages and example pages may contain content adapted from various sources. Each page lists its license and attribution at the bottom.
 
 Love2d installation instructions have been adapted from the [Love2d wiki: Getting Started](https://www.love2d.org/wiki/Getting_Started), GNU Free Documentation License 1.3.
 
-L5 is currently initiated and currently led by [Lee Tusman](https://leetusman.com/). Contributors are welcomed.
+L5 is initiated and currently led by [Lee Tusman](https://leetusman.com/). Contributors are welcomed.
 
 [Mercury Blob](https://www.dafont.com/mercury-blob.font) by Matt Perkins. This website is built using [Material for Mkdocs](https://mrkeo.github.io/).