Update documentation around PlayerJumpEvent

Spigot-API-Patches/0070-Add-PlayerJumpEvent.patch

@@ -1,4 +1,4 @@
-From d1874a92aadb4b6161c2b49276cd76740cc30919 Mon Sep 17 00:00:00 2001
+From e35607cf3ee0d7905ad75771762bc290f16cc359 Mon Sep 17 00:00:00 2001
 From: Zach Brown <zach.brown@destroystokyo.com>
 Date: Thu, 28 Sep 2017 17:21:32 -0400
 Subject: [PATCH] Add PlayerJumpEvent
@@ -6,10 +6,10 @@ Subject: [PATCH] Add PlayerJumpEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/player/PlayerJumpEvent.java b/src/main/java/com/destroystokyo/paper/event/player/PlayerJumpEvent.java
 new file mode 100644
-index 00000000..1ea9c65f
+index 00000000..dd24f9b0
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/player/PlayerJumpEvent.java
-@@ -0,0 +1,97 @@
+@@ -0,0 +1,101 @@
 +package com.destroystokyo.paper.event.player;
 +
 +import com.google.common.base.Preconditions;
@@ -20,7 +20,11 @@ index 00000000..1ea9c65f
 +import org.bukkit.event.player.PlayerEvent;
 +
 +/**
-+ * Holds information for player jump events
++ * Called when the server detects the player is jumping.
++ * <p>
++ * Added to avoid the overhead and special case logic that many plugins use
++ * when checking for jumps via PlayerMoveEvent, this event is fired whenever
++ * the server detects that the player is jumping.
 + */
 +public class PlayerJumpEvent extends PlayerEvent implements Cancellable {
 +    private static final HandlerList handlers = new HandlerList();
@@ -95,7 +99,7 @@ index 00000000..1ea9c65f
 +
 +    private void validateLocation(Location loc) {
 +        Preconditions.checkArgument(loc != null, "Cannot use null location!");
-+        Preconditions.checkArgument(loc.getWorld() != null, "Cannot use null location with null world!");
++        Preconditions.checkArgument(loc.getWorld() != null, "Cannot use location with null world!");
 +    }
 +
 +    @Override