Fix some javadoc warnings

Also remove a couple old/broken deprecated methods

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/potion/Potion.java

@@ -26,7 +26,6 @@ public class Potion {
      * water bottle.
      *
      * @param type The potion type
-     * @see #Potion(int)
      */
     public Potion(@NotNull PotionType type) {
         Validate.notNull(type, "Null PotionType");
@@ -77,14 +76,6 @@ public class Potion {
         this.extended = extended;
     }
 
-    /**
-     * @deprecated
-     */
-    @Deprecated
-    public Potion(int name) {
-        this(PotionType.WATER);
-    }
-
     /**
      * Chain this to the constructor to make the potion a splash potion.
      *