Update docstring (config file) and attempt to honor PEP0257

config/custom_components/example.py

@@ -12,7 +12,7 @@ Example component to target an entity_id to:
 Configuration:
 
 To use the Example custom component you will need to add the following to
-your config/configuration.yaml
+your configuration.yaml file.
 
 example:
   target: TARGET_ENTITY

config/custom_components/hello_world.py

@@ -1,16 +1,14 @@
 """
 custom_components.hello_world
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 Implements the bare minimum that a component should implement.
 
 Configuration:
 
 To use the hello_word component you will need to add the following to your
-config/configuration.yaml
+configuration.yaml file.
 
 hello_world:
-
 """
 
 # The domain of your component. Should be equal to the name of your component

config/custom_components/mqtt_example.py

@@ -1,7 +1,6 @@
 """
 custom_components.mqtt_example
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 Shows how to communicate with MQTT. Follows a topic on MQTT and updates the
 state of an entity to the last message received on that topic.
 
@@ -12,7 +11,7 @@ example payload {"new_state": "some new state"}.
 Configuration:
 
 To use the mqtt_example component you will need to add the following to your
-config/configuration.yaml
+configuration.yaml file.
 
 mqtt_example:
   topic: home-assistant/mqtt_example