document how plan names are derived

[Jason Mimick]

Users will need to understand what the name really means.

Issue to document how the names and other catalog metadata are derived.

atlas-osb/pkg/broker/catalog.go

Line 211 in a7e8d8f

 Name:        fmt.Sprintf("%s-%s", instanceSize.Name, id), 

Merge into wiki spec.

[Jason Mimick]

Completed in wiki
https://github.com/jasonmimick/atlas-osb/wiki/Atlas-Service-Broker-Custom-Plans-with-Resource-Templates#multiple-api-key-support