Fix a badly-formatted Python block in the docs

The whole block is indented, though a code block with Python formatting is there.

docs/faq.md

@@ -206,30 +206,30 @@ these steps into your package's build process. For example, if you're using
 setuptools, you can add steps to your package's `setup.py` using a structure
 like this:
 
-    ```python
+```python
-    import subprocess
+import subprocess
-    import setuptools
+import setuptools
-    import setuptools.command.build_py
+import setuptools.command.build_py
 
 
-    class BuildPyCommand(setuptools.command.build_py.build_py):
+class BuildPyCommand(setuptools.command.build_py.build_py):
-      """Custom build command."""
+    """Custom build command."""
 
-      def run(self):
+    def run(self):
         # your custom build steps here
         # e.g.
         #   subprocess.run(['python', 'scripts/my_custom_script.py'], check=True)
         setuptools.command.build_py.build_py.run(self)
 
 
-    setuptools.setup(
+setuptools.setup(
-        cmdclass={
+    cmdclass={
-            'build_py': BuildPyCommand,
+        'build_py': BuildPyCommand,
-        },
+    },
-        # Usual setup() args.
+    # Usual setup() args.
-        # ...
+    # ...
-    )
+)
-    ```
+```
 
 #### Compiler flags