Update info to retrieve available runtimes (#1024)

#83 (comment)

docs/quick-start.md

@@ -88,7 +88,7 @@ INFO[0000] Check the deployment status executing 'kubeless function ls hello'
 Let's dissect the command:
 
 * `hello`: This is the name of the function we want to deploy.
-* `--runtime python2.7`: This is the runtime we want to use to run our function. Available runtimes are shown in the help information.
+* `--runtime python2.7`: This is the runtime we want to use to run our function. Available runtimes can be found executing `kubeless get-server-config`.
 * `--from-file test.py`: This is the file containing the function code. It is supported to specify a zip file as far as it doesn't exceed the maximum size for an etcd entry (1 MB).
 * `--handler test.foobar`: This specifies the file and the exposed function that will be used when receiving requests. In this example we are using the function `foobar` from the file `test.py`.