Fix docs CI, formatting in command_line.rst (#12905)

Author: erikkemperman

.github/workflows/docs.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: '3.10'
+          python-version: '3.7'
       - name: Install tox
         run: pip install --upgrade 'setuptools!=50' 'virtualenv>=20.6.0' tox==3.24.5
       - name: Setup tox environment

docs/source/command_line.rst

@@ -216,7 +216,7 @@ imports.
 
     The default logic used to scan through search paths to resolve imports has a
     quadratic worse-case behavior in some cases, which is for instance triggered
-    by a large number of folders sharing a top-level namespace as in:
+    by a large number of folders sharing a top-level namespace as in::
 
         foo/
             company/
@@ -230,7 +230,7 @@ imports.
             company/
                 baz/
                     c.py
-       ...
+        ...
 
     If you are in this situation, you can enable an experimental fast path by
     setting the :option:`--fast-module-lookup` option.