spell fix

libs/nshmp-haz/www/probability-service/probability-usage.model.ts

@@ -5,5 +5,5 @@ import {RateRequestMetadata} from '../rates-service/rate-usage.model';
 export type ProbabilityUsage = Response<string, ProbabilityRequestMetadata>;
 
 export interface ProbabilityRequestMetadata extends RateRequestMetadata {
-  timespane: DoubleParameter;
+  timespan: DoubleParameter;
 }