Fix typo in TechnicalPiston documentation

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

paper-api/src/main/java/org/bukkit/block/data/type/TechnicalPiston.java

@@ -11,14 +11,14 @@ public interface TechnicalPiston extends Directional {
     /**
      * Gets the value of the 'type' property.
      *
-     * @return the 'stage' value
+     * @return the 'type' value
      */
     Type getType();
 
     /**
      * Sets the value of the 'type' property.
      *
-     * @param type the new ''type value
+     * @param type the new 'type' value
      */
     void setType(Type type);