8016101: Fix typo in SerialRef and missing @param in SerialStruct

Reviewed-by: darcy

src/share/classes/javax/sql/rowset/serial/SerialRef.java

@@ -202,7 +202,7 @@ public class SerialRef implements Ref, Serializable, Cloneable {
     }
 
     /**
-     * Returns a clone of this {@code SerialRef}. .
+     * Returns a clone of this {@code SerialRef}.
      * The underlying {@code Ref} object will be set to null.
      *
      * @return  a clone of this SerialRef

src/share/classes/javax/sql/rowset/serial/SerialStruct.java

@@ -87,6 +87,7 @@ public class SerialStruct implements Struct, Serializable, Cloneable {
      * object for custom mapping the SQL structured type or any of its
      * attributes that are SQL structured types.
      *
+     * @param in an instance of {@code Struct}
      * @param map a <code>java.util.Map</code> object in which
      *        each entry consists of 1) a <code>String</code> object
      *        giving the fully qualified name of a UDT and 2) the