Fix indentation of code example in chapter 7 (#5329)

Author: berkerpeksag

docs/tutorial/7-schemas-and-client-libraries.md

@@ -36,15 +36,15 @@ API schema.
 We can now include a schema for our API, by including an autogenerated schema
 view in our URL configuration.
 
-```
-    from rest_framework.schemas import get_schema_view
+```python
+from rest_framework.schemas import get_schema_view
 
-    schema_view = get_schema_view(title='Pastebin API')
+schema_view = get_schema_view(title='Pastebin API')
 
-    urlpatterns = [
-        url(r'^schema/$', schema_view),
-        ...
-    ]
+urlpatterns = [
+    url(r'^schema/$', schema_view),
+    ...
+]
 ```
 
 If you visit the API root endpoint in a browser you should now see `corejson`