chore: fix typo in test comment

Author: dunglas

frankenphp_test.go

@@ -330,7 +330,7 @@ func TestMalformedCookie(t *testing.T) {
 	runTest(t, func(handler func(http.ResponseWriter, *http.Request), _ *httptest.Server, i int) {
 		req := httptest.NewRequest("GET", "http://example.com/cookies.php", nil)
 		req.Header.Add("Cookie", "foo =bar; ===;;==;  .dot.=val  ;\x00 ; PHPSESSID=1234")
-		// Muliple Cookie header should be joined https://www.rfc-editor.org/rfc/rfc7540#section-8.1.2.5
+		// Multiple Cookie header should be joined https://www.rfc-editor.org/rfc/rfc7540#section-8.1.2.5
 		req.Header.Add("Cookie", "secondCookie=test; secondCookie=overwritten")
 		w := httptest.NewRecorder()
 		handler(w, req)