Fix YAML formatting errors so Github actions will run

Author: GenevieveBuckley

.github/workflows/build_docs.yaml

@@ -19,14 +19,7 @@ permissions:
 jobs:
   # Build the documentation and upload the static HTML files as an artifact.
   build:
-	runs-on: ubuntu-latest
-  # runs-on: ${{ matrix.platform }}
-  # strategy:
-  #   matrix:
-  #     platform: [ubuntu-latest]
-  #     python: ["3.10"]
-  # 	backend: [pyqt5`]
-
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2