Remove periods in reverse gesture toasts

This CL removed the periods in the strings of reverse
gesture toasts

Bug: 1107183
Change-Id: Ia2196d08443a4ecc08a59e1680388eb74b2c3543
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535913Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827007}

ash/ash_strings.grd

@@ -524,16 +524,16 @@ This file contains the strings for ash.
         Use gestures to quickly switch between apps and interact with your Chromebook in tablet mode.
       </message>
       <message name="IDS_CHANGE_ENTER_OVERVIEW_REVERSE_GESTURE" desc="The toast of changing enter overview gesture">
-        Swipe up with three fingers to enter Overview.
+        Swipe up with three fingers to enter Overview
       </message>
       <message name="IDS_CHANGE_EXIT_OVERVIEW_REVERSE_GESTURE" desc="The toast of changing exit overview gesture">
-        Swipe down with three fingers to exit Overview.
+        Swipe down with three fingers to exit Overview
       </message>
       <message name="IDS_CHANGE_NEXT_DESK_REVERSE_GESTURE" desc="The toast of changing reverse gesture to switch to the next desk.">
-        Swipe right with four fingers to switch to the next desk.
+        Swipe right with four fingers to switch to the next desk
       </message>
       <message name="IDS_CHANGE_LAST_DESK_REVERSE_GESTURE" desc="The toast of changing reverse gesture to switch to the previous desk.">
-        Swipe left with four fingers to switch to the previous desk.
+        Swipe left with four fingers to switch to the previous desk
       </message>
       <message name="IDS_UPDATE_NOTIFICATION_MESSAGE_LEARN_MORE" desc="The body of the notification to notify that the user should restart to get system updates. This notification body links to the info page on the update.">
         Learn more about the latest <ph name="SYSTEM_APP_NAME">$1<ex>Chromium OS</ex></ph> update

ash/ash_strings_grd/IDS_CHANGE_ENTER_OVERVIEW_REVERSE_GESTURE.png.sha1

-622f28d4eeb7b0cc390bd1e7a9f592f06178494b
\ No newline at end of file
+009c23f32f3fe63c6ec0caa1cbeaec475a409c4b
\ No newline at end of file

ash/ash_strings_grd/IDS_CHANGE_EXIT_OVERVIEW_REVERSE_GESTURE.png.sha1

-92f4ed826ea31c87ba4f55bd171ae6a46ac706e2
\ No newline at end of file
+20c6b4db1628209cd092b842802867fe1124772d
\ No newline at end of file

ash/ash_strings_grd/IDS_CHANGE_LAST_DESK_REVERSE_GESTURE.png.sha1

-eead565fcdee8f9d9d0b5d07715fa17b85183d0b
\ No newline at end of file
+9215861aa86112b9d25fd821c95bbe75fa241e5e
\ No newline at end of file

ash/ash_strings_grd/IDS_CHANGE_NEXT_DESK_REVERSE_GESTURE.png.sha1

-743860831655432732985b7bb995b57435d940e3
\ No newline at end of file
+22fecb69d08523dab71405309a705c4d79059b58
\ No newline at end of file