Fixed a typo in the configs api doc

The documentation for id in ConfigApiMixin inspect_config was wrongly
mentioning removal of a config
Signed-off-by: Maximilian Bischoff <maximilianbischoff2@gmail.com>

docker/api/config.py

@@ -42,7 +42,7 @@ class ConfigApiMixin(object):
             Retrieve config metadata
 
             Args:
-                id (string): Full ID of the config to remove
+                id (string): Full ID of the config to inspect
 
             Returns (dict): A dictionary of metadata