Upgrade/Install: Improve copy for opt-in to automatic major version updates.

Props marybaum, kebbet.
See #50907.

Built from https://develop.svn.wordpress.org/trunk@49285


git-svn-id: http://core.svn.wordpress.org/trunk@49047 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/update-core.php

@@ -368,7 +368,7 @@ function core_auto_updates_settings() {
 		<p>
 			<input type="checkbox" name="core-auto-updates-major" id="core-auto-updates-major" value="1" <?php checked( $auto_update_settings['major'], 1 ); ?> />
 			<label for="core-auto-updates-major">
-				<?php _e( 'Keep my site up-to-date with regular feature updates (major versions).' ); ?>
+				<?php _e( 'Automatically keep this site up-to-date with regular feature updates.' ); ?>
 			</label>
 		</p>
 		<?php

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-beta1-49284';
+$wp_version = '5.6-beta1-49285';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.