doc(overrides): remove "one of" that was misleading (#4168)

docs/api.md

@@ -3963,7 +3963,7 @@ Whenever a network route is set up with [page.route(url, handler)](#pagerouteurl
 Aborts the route's request.
 
 #### route.continue([overrides])
-- `overrides` <[Object]> Optional request overrides, which can be one of the following:
+- `overrides` <[Object]> Optional request overrides, can override following properties:
   - `method` <[string]> If set changes the request method (e.g. GET or POST)
   - `postData` <[string]|[Buffer]> If set changes the post data of request
   - `headers` <[Object]<[string], [string]>> If set changes the request HTTP headers. Header values will be converted to a string.

test/request-continue.spec.ts

@@ -67,6 +67,19 @@ it('should amend post data', async ({page, server}) => {
   expect((await serverRequest.postBody).toString('utf8')).toBe('doggo');
 });
 
+it('should amend method and post data', async ({page, server}) => {
+  await page.goto(server.EMPTY_PAGE);
+  await page.route('**/*', route => {
+    route.continue({ method: 'POST', postData: 'doggo' });
+  });
+  const [serverRequest] = await Promise.all([
+    server.waitForRequest('/sleep.zzz'),
+    page.evaluate(() => fetch('/sleep.zzz', { method: 'GET' }))
+  ]);
+  expect(serverRequest.method).toBe('POST');
+  expect((await serverRequest.postBody).toString('utf8')).toBe('doggo');
+});
+
 it('should amend utf8 post data', async ({page, server}) => {
   await page.goto(server.EMPTY_PAGE);
   await page.route('**/*', route => {