Reword the comment on TestCORSAnswersWithConfiguredOrigin (closes #61)

The comment was not a readable sentence; it is now one plain sentence
saying what the test checks.

Model: opus-5-5

internal/middleware/middleware_internal_test.go

@@ -10,8 +10,8 @@ import (
 )
 
 // TestCORSAnswersWithConfiguredOrigin checks that the CORS middleware
-// uses access_control_allow_origin: "*" lets any origin read responses,
+// answers with access_control_allow_origin, where "*" lets any origin read
-// and a single origin lets that origin read them and no other.
+// responses and a single origin lets only that origin read them.
 func TestCORSAnswersWithConfiguredOrigin(t *testing.T) {
 	t.Parallel()