add comment explanation

Author: lindsey-volta

src/components/CampaignURLBuilder/index.spec.tsx

@@ -23,6 +23,8 @@ import { GAVersion } from "../../constants"
 // Capture original error global so it's easier to replace after a mock.
 const originalError = console.error
 
+// Increase the timeout for this test suite. The userEvent.type calls can
+// be slow, and the default 5s timeout is not always enough.
 jest.setTimeout(10000)
 describe("for the Campaign URL Builder component", () => {
   beforeEach(() => {

src/components/ga4/EventBuilder/index.spec.tsx

@@ -23,6 +23,8 @@ import { Label } from "./types"
 import userEvent from "@testing-library/user-event"
 import { within } from "@testing-library/react"
 
+// Increase the timeout for this test suite. The userEvent.type calls can
+// be slow, and the default 5s timeout is not always enough.
 jest.setTimeout(10000)
 
 describe("Event Builder", () => {