[CrOS PhoneHub] Change Notification row tooltip icon from (?) to (i)

This CL changes the help tooltip icon to an info tooltip icon present
on the PhoneHub Notification row in OS Settings multidevice, when
work profile is active

Screenshot:
https://screenshot.googleplex.com/ByKEpvhP8EnaL4m

Fixed: 1166677
Bug: 1106937
Change-Id: I1fd28c567f16366d2f905c04185d31d3003b8d1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627338
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843738}

chrome/browser/resources/settings/chromeos/multidevice_page/multidevice_feature_item.html

@@ -69,7 +69,7 @@
           </cr-icon-button>
         </template>
         <template is="dom-if" if="[[infoTooltip]]" restamp>
-          <iron-icon id="help-icon" tabindex="0" icon="cr:help-outline"
+          <iron-icon id="help-icon" tabindex="0" icon="cr:info-outline"
               aria-labelledby="tooltip">
           </iron-icon>
           <paper-tooltip id="tooltip" for="help-icon" position="top"