Fix documentation for chrome.networking.onc API

Bug: 1012629
Change-Id: Iac0c0492356159598055acf15ef27aad008bf43e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876351Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708654}

extensions/common/api/networking_onc.idl

@@ -5,7 +5,7 @@
 // <p>
 //   The <code>chrome.networking.onc</code> API is used for configuring
 //   network connections (Cellular, Ethernet, VPN or WiFi).
-//   This API is available in Chrome OS kiosk sessions.
+//   This API is available in auto-launched Chrome OS kiosk sessions.
 // </p>
 // <p>
 //   Network connection configurations are specified following