cros: Update KSV string for Multipaste

UX prefers this string.

Bug: 1142473
Change-Id: I0fb5d1ac20b9c0dc8b2e44eb7e87c28307fabf9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544881
Auto-Submit: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828485}

ash/shortcut_viewer/shortcut_viewer_strings.grd

@@ -482,7 +482,7 @@
     Select everything on the page
   </message>
   <message name="IDS_KSV_DESCRIPTION_CLIPBOARD_HISTORY" desc="Description of the command in keyboard shortcut viewer.">
-    Show the last few things copied onto the clipboard
+    Open Clipboard
   </message>
   <message name="IDS_KSV_DESCRIPTION_COPY" desc="Description of the command in keyboard shortcut viewer.">
     Copy selected content to the clipboard

ash/shortcut_viewer/shortcut_viewer_strings_grd/IDS_KSV_DESCRIPTION_CLIPBOARD_HISTORY.png.sha1

-0bf45f393c3fbc320216dc6910f3e82df60c5be5
+cc24ab8cf47e172db078f5a8d18f5f3ab40fa507
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