Post-patch cleanup

Add link for info on building library documentation

Author: tekktrik

README.rst

@@ -95,6 +95,8 @@ Documentation
 
 API documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/display-shapes/en/latest/>`_.
 
+For information on building library documentation, please check out `this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>`_.
+
 Contributing
 ============