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From a template users POV it is not importent when they use a struct field or
method. They only notice the difference when the function requires arguments.
So lets be nice and let the user know that this method requires arguments
via the help text.
This is how it now looks like when the completion descriptions are enabled
on bash:
```
$ bin/podman ps --format {{.Created.A
{{.Created.AddDate (This is a function and requires 3 arguments) {{.Created.After (This is a function and requires 1 argument)
{{.Created.Add (This is a function and requires 1 argument) {{.Created.AppendFormat (This is a function and requires 2 arguments)
```
Signed-off-by: Paul Holzinger <pholzing@redhat.com>