cleaning up a readthedocs.yaml file

.readthedocs.yaml

 version: 2
 
 build:
-  os: "ubuntu-22.04"
+  os: ubuntu-22.04
   tools:
     python: "3.11"
   apt_packages:
-    - "doxygen"
-    - "cmake"
+    - doxygen
+    - cmake
   jobs:
     pre_build:
-      - "cmake -S . -B build -DBUILD_DOCUMENTATION=ON"
-      - "cmake --build build --target Doxygen"
+      - cmake -S . -B build -DBUILD_DOCUMENTATION=ON
+      - cmake --build build --target Doxygen
 
 # Build from the docs/ directory with Sphinx
 sphinx: