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/inventory/ItemFactory.java

@@ -132,10 +132,10 @@ public interface ItemFactory {
      * Apply a material change for an item meta. Do not use under any
      * circumstances.
      *
-     * @param meta
-     * @param material
+     * @param meta meta
+     * @param material material
      * @return updated material
-     * @throws IllegalArgumentException
+     * @throws IllegalArgumentException if bad material or data
      * @deprecated for internal use only
      */
     @Deprecated

paper-api/src/main/java/org/bukkit/inventory/Merchant.java

@@ -34,7 +34,7 @@ public interface Merchant {
      *
      * @param i the index
      * @return the recipe
-     * @throws IndexOutOfBoundsException
+     * @throws IndexOutOfBoundsException if recipe index out of bounds
      */
     @NotNull
     MerchantRecipe getRecipe(int i) throws IndexOutOfBoundsException;
@@ -44,7 +44,7 @@ public interface Merchant {
      *
      * @param i the index
      * @param recipe the recipe
-     * @throws IndexOutOfBoundsException
+     * @throws IndexOutOfBoundsException if recipe index out of bounds
      */
     void setRecipe(int i, @NotNull MerchantRecipe recipe) throws IndexOutOfBoundsException;
 

paper-api/src/main/java/org/bukkit/inventory/meta/CrossbowMeta.java

@@ -27,7 +27,7 @@ public interface CrossbowMeta extends ItemMeta {
      *
      * Removes all projectiles when given null.
      *
-     * @param projectiles
+     * @param projectiles the projectiles to set
      * @throws IllegalArgumentException if one of the projectiles is not an
      * arrow or firework rocket
      */

paper-api/src/main/java/org/bukkit/inventory/meta/ItemMeta.java

@@ -379,7 +379,7 @@ public interface ItemMeta extends Cloneable, ConfigurationSerializable, Persiste
     /**
      * Internal use only! Do not use under any circumstances!
      *
-     * @param version
+     * @param version version
      * @deprecated
      */
     @Deprecated

paper-api/src/main/java/org/bukkit/inventory/meta/tags/ItemTagType.java

@@ -11,7 +11,7 @@ import org.jetbrains.annotations.NotNull;
  * different complex types. This may be useful for the likes of a
  * UUIDItemTagType:
  * <pre>
- * <code>{@code
+ * {@code
  * public class UUIDItemTagType implements ItemTagType<byte[], UUID> {
  *
  *         {@literal @Override}
@@ -39,7 +39,7 @@ import org.jetbrains.annotations.NotNull;
  *             long secondLong = bb.getLong();
  *             return new UUID(firstLong, secondLong);
  *         }
- *     }}</code></pre>
+ *     }}</pre>
  *
  * @param <T> the primary object type that is stored in the given tag
  * @param <Z> the retrieved object type when applying this item tag type