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

@@ -206,13 +206,13 @@ 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."""
 
     def run(self):
@@ -222,14 +222,14 @@ like this:
         setuptools.command.build_py.build_py.run(self)
 
 
-    setuptools.setup(
+setuptools.setup(
     cmdclass={
         'build_py': BuildPyCommand,
     },
     # Usual setup() args.
     # ...
-    )
+)
-    ```
+```
 
 #### Compiler flags