chaincfg: fix panic wording in test comment

Signed-off-by: zjuzhongwen <zjuzhongwen@outlook.com>

Author: zjuzhongwen

chaincfg/params_test.go

@@ -23,7 +23,7 @@ func TestMustRegisterPanic(t *testing.T) {
 	t.Parallel()
 
 	// Setup a defer to catch the expected panic to ensure it actually
-	// paniced.
+	// panicked.
 	defer func() {
 		if err := recover(); err == nil {
 			t.Error("mustRegister did not panic as expected")