Swap some nullable annotations (#9696)

patches/api/Add-WardenAngerChangeEvent.patch

@@ -19,8 +19,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
++import org.jetbrains.annotations.ApiStatus;
 +import org.jetbrains.annotations.NotNull;
-+import org.jetbrains.annotations.Nullable;
 +
 +/**
 + * Called when a Warden's anger level has changed due to another entity.
@@ -29,13 +29,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + */
 +public class WardenAngerChangeEvent extends EntityEvent implements Cancellable {
 +
-+    private static final HandlerList handlers = new HandlerList();
++    private static final HandlerList HANDLER_LIST = new HandlerList();
++
 +    private boolean cancelled;
 +    private final Entity target;
 +    private final int oldAnger;
 +    private int newAnger;
 +
-+    public WardenAngerChangeEvent(@NotNull final Warden warden, @Nullable final Entity target, final int oldAnger, final int newAnger) {
++    @ApiStatus.Internal
++    public WardenAngerChangeEvent(@NotNull final Warden warden, @NotNull final Entity target, final int oldAnger, final int newAnger) {
 +        super(warden);
 +        this.target = target;
 +        this.oldAnger = oldAnger;
@@ -43,11 +45,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    /**
-+     * Gets the entity (if any) which triggered this anger update.
++     * Gets the entity which triggered this anger update.
 +     *
-+     * @return triggering entity, or null
++     * @return triggering entity
 +     */
-+    @Nullable
++    @NotNull
 +    public Entity getTarget() {
 +        return target;
 +    }
@@ -107,11 +109,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
-+        return handlers;
++        return HANDLER_LIST;
 +    }
 +
 +    @NotNull
 +    public static HandlerList getHandlerList() {
-+        return handlers;
++        return HANDLER_LIST;
 +    }
 +}