[docs] update service.available() example for API v4

Gauvain Pocentek · Gauvain Pocentek · commit 6d4ef0fcf04a · 2018-05-10T15:03:18.000+02:00
Fixes python-gitlab#482
diff --git a/docs/gl_objects/projects.py b/docs/gl_objects/projects.py
@@ -288,7 +288,8 @@
 # end service get
 
 # service list
-services = gl.project_services.available()
+services = gl.project_services.available()  # API v3
+services = project.services.available()  # API v4
 # end service list
 
 # service update
