Correct child user type doc

Change-Id: I54d96d45889729f1de91a8c16c176565acb7efc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637945Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665320}

docs/login/user_types.md

@@ -18,8 +18,8 @@ Regular users that were registered using their GAIA account.
 
 Users that logged in using
 *   a child account - an account designated for children under the age of 13.
-*   a Geller account - an account with parental supervision designated for
-    children between ages 13 and 18.
+*   a Geller account - an account with parental supervision that has no age
+    restrictions.
 
 In order to add a child user to the device, the user has to go through an
 adapted GAIA flow, which also requires their parent to authenticate.