Update example SearchPrefix from Carbonsearch
Update example SearchPrefix from Carbonsearch

Carbonsearch added '*' to the query prefix to hint some clients (notably
graphite-web) that potentially more than 1 series would be returned.

https://github.com/kanatohodets/carbonsearch/commit/49b6a910b7e546876c1d9b9495d1ff73e0fe11ab

dgryski/carbonapi,dgryski/carbonzipper