[ci skip] Fix incorrect javadoc for Mob pathfinding API (#6842)

patches/api/Mob-Pathfinding-API.patch

@@ -214,7 +214,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +        /**
 +         * @return Returns the index of the current point along the points returned in {@link #getPoints()} the entity
-+         * is trying to reach, or null if we are done with this pathfinding.
++         * is trying to reach. This value will be higher than the maximum index of {@link #getPoints()} if this path finding is done.
 +         */
 +        int getNextPointIndex();
 +