Help/About: Simplify help text on Updates screen to account for third-party updates.

Follow-up to [14837], [26818], [33704].

Props NekoJonez, costdev, oglekler, SergeyBiryukov.
Fixes #57672.

git-svn-id: https://develop.svn.wordpress.org/trunk@61408 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/update-core.php

@@ -987,7 +987,7 @@ function do_undismiss_core_update() {
 $title       = __( 'WordPress Updates' );
 $parent_file = 'index.php';
 
-$updates_overview  = '<p>' . __( 'On this screen, you can update to the latest version of WordPress, as well as update your themes, plugins, and translations from the WordPress.org repositories.' ) . '</p>';
+$updates_overview  = '<p>' . __( 'On this screen, you can update to the latest version of WordPress, as well as update your themes, plugins, and translations.' ) . '</p>';
 $updates_overview .= '<p>' . __( 'If an update is available, you&#8127;ll see a notification appear in the Toolbar and navigation menu.' ) . ' ' . __( 'Keeping your site updated is important for security. It also makes the internet a safer place for you and your readers.' ) . '</p>';
 
 get_current_screen()->add_help_tab(