tweak wording

Author: tillkruss

includes/diagnostics.php

@@ -58,7 +58,7 @@
 $info['Metrics'] = \Rhubarb\RedisCache\Metrics::is_active() ? 'Enabled' : 'Disabled';
 $info['Metrics recorded'] = wp_json_encode( \Rhubarb\RedisCache\Metrics::count() );
 
-$info['Filesystem'] = is_wp_error( $filesystem ) ? $filesystem->get_error_message() : 'Working';
+$info['Filesystem'] = is_wp_error( $filesystem ) ? $filesystem->get_error_message() : 'Writable';
 
 if ( $dropin && ! $disabled ) {
     $info['Global Prefix'] = wp_json_encode( $wp_object_cache->global_prefix );