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Many of the flows in the system fall into special groups that have to follow an additional naming convention. For example, a login flow name must start with the prefix "authn/", as in the example above.
If you have a need to override or supplement existing flow mappings, you can supply two maps called shibboleth.FlowMap and shibboleth.FlowPatterns to replace, or more likely merge themselves with, the default beans mentioned above. The main use case for this would be to override the flow installed to one of the built-in locations or to register one of the built-in flows at an additional location. The practical reason you would do this would be to add additional endpoints for various services to fit some kind of unusual requirement.