Many javadoc fixes thanks to Celtic Minstrel

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/entity/Boat.java

@@ -10,14 +10,14 @@ public interface Boat extends Vehicle {
     /**
      * Gets the maximum speed of a boat. The speed is unrelated to the velocity.
      *
-     * @param speed
+     * @return The max speed.
      */
     public double getMaxSpeed();
 
     /**
      * Sets the maximum speed of a boat. Must be nonnegative. Default is 0.4D.
      *
-     * @param speed
+     * @param speed The max speed.
      */
     public void setMaxSpeed(double speed);
 }