RFR: XS,docs,13 JDK-8226592: Fix HTML in table for jdk.zipfs module-info

[Jonathan Gibbons]

Please review a tiny fix to the HTML for a table in jdk.zipfs 
module-info.java.  The fix is just to change some cells from <td> to 
<th>.  Because of the specified style (striped) for the table, there is 
no change in the default appearance of this table.

The change is simple enough to show the patch below.

JBS: https://bugs.openjdk.java.net/browse/JDK-8226592

-- Jon

$ hg diff -R open
diff -r e00591da418d src/jdk.zipfs/share/classes/module-info.java
--- a/src/jdk.zipfs/share/classes/module-info.java Fri Jun 21 10:38:53 
2019 -0700
+++ b/src/jdk.zipfs/share/classes/module-info.java Fri Jun 21 11:25:09 
2019 -0700
@@ -60,7 +60,7 @@
   *
   * <tbody>
   * <tr>
- *   <td scope="row">create</td>
+ *   <th scope="row">create</th>
   *   <td>java.lang.String</td>
   *   <td>false</td>
   *   <td>
@@ -69,7 +69,7 @@
   *   </td>
   * </tr>
   * <tr>
- *   <td scope="row">encoding</td>
+ *   <th scope="row">encoding</th>
   *   <td>java.lang.String</td>
   *   <td>UTF-8</td>
   *   <td>