RFR [XS/docs] JDK-8225094: Fix minor HTML issues in jdk.zipfs

[Jonathan Gibbons]

Please review a simple docs fix for jdk.zipfs module-info.java.

The ranks of the headings are updated to close up the gaps, and a couple 
of superfluous <p> are removed.

Webrev link below, but the patch is small enough to read inline if you want.

-- Jon

JBS: https://bugs.openjdk.java.net/browse/JDK-8225094
Webrev: http://cr.openjdk.java.net/~jjg/8225094/webrev.00/webrev/index.html


--- old/src/jdk.zipfs/share/classes/module-info.java	2019-05-30 17:57:05.203832090 -0700
+++ new/src/jdk.zipfs/share/classes/module-info.java	2019-05-30 17:57:04.991832098 -0700
@@ -26,9 +26,8 @@
  /**
   * Provides the implementation of the Zip file system provider.
   * The Zip file system provider treats the contents of a Zip or JAR file as a file system.
- * <p>
   *
- * <h3>Accessing a Zip File System</h3>
+ * <h2>Accessing a Zip File System</h2>
   *
   * The {@linkplain java.nio.file.FileSystems FileSystems} {@code newFileSystem}
   * static factory methods can be used to:
@@ -41,11 +40,10 @@
   *
   * The URI {@link java.net.URI#getScheme scheme} that identifies the ZIP file system is {@code jar}.
   *
- * <h3>Zip File System Properties</h3>
+ * <h2>Zip File System Properties</h2>
   *
   * The following properties may be specified when creating a Zip
   * file system:
- * <p>
   * <table class="striped">
   * <caption style="display:none">
   *     Configurable properties that may be specified when creating
@@ -82,7 +80,7 @@
   * </tbody>
   * </table>
   *
- * <h3>Examples:</h3>
+ * <h2>Examples:</h2>
   *
   * Construct a new Zip file system that is identified by a URI.  If the Zip file does not exist,
   * it will be created: