Update rtd config

.readthedocs.yaml

@@ -1,12 +1,10 @@
----
-# .readthedocs.yaml
-# Read the Docs configuration file
+# Read the Docs configuration file for Sphinx projects
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
 # Required
 version: 2
 
-# Set the version of Python and other tools you might need
+# Set the OS, Python version and other tools you might need
 build:
   os: ubuntu-22.04
   tools:
@@ -16,15 +14,17 @@ build:
     # rust: "1.64"
     # golang: "1.19"
 
-# Build documentation in the docs/ directory with Sphinx
+# Build documentation in the "docs/" directory with Sphinx
 sphinx:
   configuration: docs/conf.py
-
-# If using Sphinx, optionally build your docs in additional formats such as PDF
+# Optionally build your docs in additional formats such as PDF and ePub
 # formats:
 #    - pdf
+#    - epub
 
-# Optionally declare the Python requirements required to build your docs
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
 python:
   install:
     - requirements: docs/requirements.txt