Update Upgrade message & docs link to current resources

Document about Version 2.0 of WC Subscriptions has been deemed historical and removed from docs. Now the notice links to information about upgrading older versions of WC Subscriptions.

Author: Brianmitchtay

includes/class-wc-subscriptions-core-plugin.php

@@ -569,8 +569,8 @@ public function update_notice( $plugin_data, $r ) {
 		}
 
 		$update_notice = '<div class="wc_plugin_upgrade_notice">';
-		// translators: placeholders are opening and closing tags. Leads to docs on version 2
-		$update_notice .= sprintf( __( 'Warning! Version 2.0 is a major update to the WooCommerce Subscriptions extension. Before updating, please create a backup, update all WooCommerce extensions and test all plugins, custom code and payment gateways with version 2.0 on a staging site. %1$sLearn more about the changes in version 2.0 &raquo;%2$s', 'woocommerce-subscriptions' ), '<a href="http://docs.woocommerce.com/document/subscriptions/version-2/">', '</a>' );
+		// translators: placeholders are opening and closing tags. Leads to docs on upgrading WooCommerce Subscriptions
+		$update_notice .= sprintf( __( 'Warning! Version 2.0 is a major update to the WooCommerce Subscriptions extension. Before updating, please create a backup, update all WooCommerce extensions and test all plugins, custom code and payment gateways with version 2.0 on a staging site. %1$sLearn more about updating older versions of WooCommerce Subscriptions &raquo;%2$s', 'woocommerce-subscriptions' ), '<a href="https://woocommerce.com/document/upgrade-instructions/">', '</a>' );
 		$update_notice .= '</div> ';
 
 		echo wp_kses_post( $update_notice );