[Eche] Update the recent apps placeholder string.

Screenshot:
https://screenshot.googleplex.com/9XcVPubvtLZVUWD.png

String request:
https://screenshot.googleplex.com/AfkuKnT9vWMCD2r.png

Bug: b/233145152
Test: Pass local test.
Change-Id: I8d235eb4f7448a4de6e79dfd235ab1b52b574eaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3649937
Reviewed-by: Daniel Nishi <dhnishi@chromium.org>
Commit-Queue: Paulz Chen <paulzchen@google.com>
Cr-Commit-Position: refs/heads/main@{#1006723}

ash/ash_strings.grd

@@ -1454,7 +1454,7 @@ This file contains the strings for ash.
         Recent apps
       </message>
       <message name="IDS_ASH_PHONE_HUB_RECENT_APPS_PLACEHOLDER" desc="The placeholder of the recently used apps section (where users relaunch it directly after an app is launched from a notification) in phone hub bubble.">
-        App streaming is now set up. Once you get started, recently launched apps will appear here.
+        When you stream your phone’s apps, they will appear here
       </message>
       <message name="IDS_ASH_PHONE_HUB_ONBOARDING_DIALOG_DESCRIPTION" desc="The description of the onboarding dialog that pops up for existing multidevice users to ask for permission when the user enables this feature.">
         Connect to your phone’s hotspot, silence and locate your device, and view recent Chrome tabs open on your phone

ash/ash_strings_grd/IDS_ASH_PHONE_HUB_RECENT_APPS_PLACEHOLDER.png.sha1

@@ -1 +1 @@
-4151847b0129be76c605c4e4821242ea1e9a4cb8
+43bd24d8438ce4585f3300028c30cef954de6664