Improve the doc and help of p:invalidate

As of now, the p:invalidate --help command only indicates tag, path and url as the accepted types. I suspect this is because these are the only types which are applicable whatever the context (or historically).

However, there is potentially more types that can be accepted by the command (depending the configuration).

There is a p:types command which provide a list of types and their status based on the configuration (enabled or not).

It would be great that p-invalidate command mentions p:types command as the source of allowed types to not make people think only tag, path and url are accepted types.