ash: Update IDS_ASH_STATUS_TRAY_DISPLAY_REMOVED description

To prevent translation errors by making it clear that the display is not
erased from some kind of list, but was disconnected from the device.

BUG=None
TEST=None

Change-Id: I456db3b6492a7041b53413cffae0ca1ab9f360dc
Reviewed-on: https://chromium-review.googlesource.com/1234075Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593080}

ash/ash_strings.grd

@@ -933,7 +933,7 @@ This file contains the strings for ash.
       <message name="IDS_ASH_STATUS_TRAY_DISPLAY_EXTENDED" desc="The label used in the tray to show that the current status is extended.">
         Extending screen to <ph name="DISPLAY_NAME">$1</ph>
       </message>
-      <message name="IDS_ASH_STATUS_TRAY_DISPLAY_REMOVED" desc="The text of the notification to show when a display is removed.">
+      <message name="IDS_ASH_STATUS_TRAY_DISPLAY_REMOVED" desc="The text of the notification to show when a display is disconnected from the device.">
         Removed display <ph name="DISPLAY_NAME">$1</ph>
       </message>
       <message name="IDS_ASH_STATUS_TRAY_DISPLAY_MIRRORING_NO_INTERNAL" desc="The label used in the tray to show that the current status is mirroring and the device doesn't have the internal display.">