Update pqrs.md

pqrs.md

@@ -59,7 +59,7 @@ LOWEST -> LOW -> NORMAL -> HIGH -> HIGHEST -> MONITOR
 Therefore, it is RECOMMENDED that plugins that plugins modifying events in a specific manner (e.g. handling specific block interaction in a sign-clicking plugin) use LOW priority, while plugins modifying events in a large scale (e.g. area protection plugins cancelling all block interaction in an area) use HIGH priority.
 
 ## 6. Custom events
-Custom events SHOULD extend pocketmine\event\plugin\PluginEvent, preferrably with a superclass for all events from the same plugin.
+Custom events SHOULD extend `pocketmine\event\plugin\PluginEvent`, preferrably with a superclass for all events from the same plugin.
 
 ## ∞. Contact / Comments
 For any discussion, visit [the forum thread](https://forums.pmmp.io/threads/pqrs.855/).