Disclaimer about router terminology on node-roles-and-types.md

[rochaferraz]

Routers are now officially named "Thread Mesh Extenders" on all consumer facing comms. Adding this information here.

Q: should we update all documentation to reflect the name change or can we still use "router" in engineering docs and primers?

[Vyrastas]

Sorry, I missed this. @jwhui is this a change we should make in the OpenThread docs?

[jwhui]

Sorry, I missed this. @jwhui is this a change we should make in the OpenThread docs?

Yes, we should put something to this effect. "Mesh Extenders" is the name Thread Group recommends for consumer-facing documentation. But "Routers" is still used by the Thread Specification.

[Vyrastas]

Yeah I would just change it a few places for now, these docs are not really for consumers. I haven't looked at the Primer material in a while, I'll have to see other places where it makes sense to change and also mention Mesh Extenders.