Update .readthedocs.yaml

Cleanup yaml format

.readthedocs.yaml

@@ -1,23 +1,15 @@
 # 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 OS, Python version and other tools you might need
 build:
   os: ubuntu-22.04
   tools:
     python: "3"
-
-# Build documentation in the "docs/" directory with Sphinx
 sphinx:
   configuration: docs/source/conf.py
-
 formats:
   - pdf
   - epub
-
- python:
-   install:
-     - requirements: requirements-dev.txt
+python:
+  install:
+    - requirements: requirements-dev.txt