docs: add missing headers option to ClientRequest options (#41731)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Jeremy Rose <jeremya@chromium.org>

docs/api/client-request.md

@@ -17,6 +17,8 @@ following properties:
     method.
   * `url` string (optional) - The request URL. Must be provided in the absolute
     form with the protocol scheme specified as http or https.
+  * `headers` Record<string, string | string[]> (optional) - Headers to be sent
+    with the request.
   * `session` Session (optional) - The [`Session`](session.md) instance with
     which the request is associated.
   * `partition` string (optional) - The name of the [`partition`](session.md)

spec/api-net-spec.ts

@@ -935,12 +935,11 @@ describe('net module', () => {
           response.end();
         });
         const serverUrl = url.parse(serverUrlUnparsed);
-        const options = {
+        const urlRequest = net.request({
           port: serverUrl.port ? parseInt(serverUrl.port, 10) : undefined,
           hostname: '127.0.0.1',
           headers: { [customHeaderName]: customHeaderValue }
-        };
-        const urlRequest = net.request(options);
+        });
         const response = await getResponse(urlRequest);
         expect(response.statusCode).to.be.equal(200);
         await collectStreamBody(response);