6615506: (fmt spec) Date/Time conversion table missing column for 'Z'

Summary: added the column entry back in
Reviewed-by: alanb

src/share/classes/java/util/Formatter.java

@@ -1581,6 +1581,7 @@ import sun.misc.FormattedFloatingDecimal;
  *     instance of the Java virtual machine.
  *
  * <tr><td valign="top">{@code 'Z'}
+ *     <td valign="top"> <tt>'&#92;u005a'</tt>
  *     <td> A string representing the abbreviation for the time zone.  This
  *     value will be adjusted as necessary for Daylight Saving Time.  For
  *     {@code long}, {@link Long}, and {@link Date} the time zone used is