Updating the accessibility wording for the sign-in promo close button

ios/chrome/app/strings/ios_strings.grd

Index: ios/chrome/app/strings/ios_strings.grd
diff --git a/ios/chrome/app/strings/ios_strings.grd b/ios/chrome/app/strings/ios_strings.grd
index 574f3dc99a633b0be321833e81ddd8ad1d06dbfa..7e1ad6383e5b682544829b5cedd158d47259cc14 100644
--- a/ios/chrome/app/strings/ios_strings.grd
+++ b/ios/chrome/app/strings/ios_strings.grd
@@ -1513,8 +1513,8 @@ Your data was encrypted with your sync passphrase on <ph name="TIME">$2<ex>Sept
       <message name="IDS_IOS_SIGNIN_PROMO_NOT" desc="Button that the user can press if they are not the profile that Chrome found (opposite of 'Continue as Joe Doe').">
         Not <ph name="EMAIL">$1<ex>john.doe@example.com</ex>?</ph>
       </message>
-      <message name="IDS_IOS_SIGNIN_PROMO_CLOSE_ACCESSIBILITY" desc="Accessibility label to describe the close button in the sign-in promo element.">
-        Close
+      <message name="IDS_IOS_SIGNIN_PROMO_CLOSE_ACCESSIBILITY" desc="Accessibility label to describe the close button action in the sign-in promo element.">
+        Close sign-in promo
       </message>
       <message name="IDS_IOS_SYSTEM_MAIL_APP" desc="Name of iOS system-provided Mail app. Note that this is not consistently translated for all locales, e.g. it is still 'Mail' (in English) for French locale, but is translated to '邮件' for Chinese locale. [Length: 10em]">
         Mail