[routingauto] Add note about namespacing benefits

[dantleech]

One of the major benefits of using RoutingAuto over conventional Symfony routes is that the system has a clear overview about what exists and would not allow one route to replace another.

If you were using standard pattern based routing in routing.yml:

/cms/article/{slug}

and also created a Route object in the hierachy at:

/cms/article/foobar

The two "routes" can co-exist - which is not good.

[dbu]

@dantleech any chance to get this wrapped up?

[dantleech]

Ack.