Clarify expected output for wp core check-update

Daniel Bachhuber · Daniel Bachhuber · commit 483a0aefcab5 · 2015-10-02T13:30:29.000-07:00
See wp-cli/wp-cli#2102
diff --git a/commands/core/check-update/index.md b/commands/core/check-update/index.md
@@ -3,7 +3,9 @@ layout: default
 title: 'wp core check-update'
 ---
 
-`wp core check-update` - Check for update via Version Check API. Returns latest version if there's an update, or empty if no update available.
+`wp core check-update` - Check for update via Version Check API.
+
+Lists the most recent versions when there are updates available, or success message when up to date.
 
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