RuntimeConfig: ok, just shrink the names to make the linter happy

Author: tswast

runtimeconfig/google/cloud/runtimeconfig/_helpers.py

@@ -49,7 +49,7 @@ def variable_name_from_full_name(full_name):
     :type full_name: string
     :param full_name: the full resource name of a variable. The full resource
                       name looks like
-                      ``projects/project-name/configs/config-name/variables/variable-name``
+                      ``projects/prj-name/configs/cfg-name/variables/var-name``
                       and is returned as the ``name`` field of a variable
                       resource.  See:
                       https://cloud.google.com/deployment-manager/runtime-configurator/reference/rest/v1beta1/projects.configs.variables