[CrOS MultiDevice] Tweak a string shown in settings.

This change was suggested by our UX string writer, jonann@.

Bug: 872982
Change-Id: I179d7e8b7abb25db822f1828d5364731a38104e0
Reviewed-on: https://chromium-review.googlesource.com/1176822Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583693}

chrome/app/settings_strings.grdp

@@ -3382,7 +3382,7 @@
       Add another
     </message>
     <message name="IDS_SETTINGS_PEOPLE_PASSWORD_PROMPT_ENTER_PASSWORD_LOCK" desc="Text above a password input field that tells the user they need to submit their password to configure these settings.">
-      To set up Smart Lock, enter your password
+      To set up screen lock, enter your password
     </message>
     <message name="IDS_SETTINGS_PEOPLE_PASSWORD_PROMPT_ENTER_PASSWORD_LOGIN_LOCK" desc="Text above a password input field that tells the user they need to submit their password to configure these settings.">
       To set up Smart Lock for sign-in, enter your password