Fix wording

Author: Olof Dahlbom

src/mocks/mock-request.js

@@ -20,7 +20,7 @@ import { mock } from 'node:test'
 
 const MATCHED_AS_UNDEFINED_IN_MOCK = 'MATCHED_AS_UNDEFINED_IN_MOCK'
 const MATCHED_BY_FUNCTION = 'MATCHED_BY_FUNCTION'
-const MISMATCH_BY_FUNCTION = 'MISMATCH_BY_FUNCTION'
+const MISMATCH_BY_FUNCTION = 'MISMATCHED_BY_FUNCTION'
 
 function MockRequest(id, props) {
   this.id = id