[Autofill Assistant] Changed onboarding message.

See also linked bug for more information.

Bug: b/163024900
Change-Id: I608a35d636808f125c4f07c58c6b6a63ed1eaae3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339468
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Auto-Submit: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795449}

chrome/android/features/autofill_assistant/java/strings/android_chrome_autofill_assistant_strings.grd

@@ -193,7 +193,7 @@
         Try voice actions\non websites
       </message>
       <message name="IDS_AUTOFILL_ASSISTANT_INIT_MESSAGE_SHOPPING" desc="Onboarding message describing autofill assistant's capability for shopping.">
-        Buy things\nin just a few taps
+        Fast checkout\nin just a few taps
       </message>
       <message name="IDS_AUTOFILL_ASSISTANT_INIT_MESSAGE" desc="Onboarding message describing autofill assistant's capability.">
         Google Assistant saves you time by helping you complete actions on the web, like search and checkout.

chrome/android/features/autofill_assistant/java/strings/android_chrome_autofill_assistant_strings_grd/IDS_AUTOFILL_ASSISTANT_INIT_MESSAGE_SHOPPING.png.sha1

+a82401140ae66929a650adfdc42dc56073f8edd2
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