core: Improve global setting grammar.

src/util.js.c

@@ -356,7 +356,7 @@ static JSValue _util_defaultGlobalSettings(JSContext* context, JSValueConst this
 			.default_value = JS_NewInt32(context, 2) },
 		{ .name = "delete_stale_feeds",
 			.type = "boolean",
-			.description = "Periodically delete feeds that visible from local accounts and related follows.",
+			.description = "Periodically delete feeds that aren't visible from local accounts or related follows.",
 			.default_value = JS_FALSE },
 	};