NIFI-3672 updated PublishJMS message property docs

This closes apache#2949

Signed-off-by: Brandon Devries <devriesb@apache.org>

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/main/java/org/apache/nifi/jms/processors/PublishJMS.java

@@ -72,7 +72,11 @@
         @ReadsAttribute(attribute = JmsHeaders.TYPE, description = "This attribute becomes the JMSType message header. Must be an integer."),
         @ReadsAttribute(attribute = JmsHeaders.REPLY_TO, description = "This attribute becomes the JMSReplyTo message header. Must be an integer."),
         @ReadsAttribute(attribute = JmsHeaders.DESTINATION, description = "This attribute becomes the JMSDestination message header. Must be an integer."),
-        @ReadsAttribute(attribute = "other attributes", description = "All other attributes that do not start with " + JmsHeaders.PREFIX + " are added as message properties.")
+        @ReadsAttribute(attribute = "other attributes", description = "All other attributes that do not start with " + JmsHeaders.PREFIX + " are added as message properties."),
+        @ReadsAttribute(attribute = "other attributes .type", description = "When an attribute will be added as a message property, a second attribute of the same name but with an extra"
+        + " `.type` at the end will cause the message property to be sent using that strong type. For example, attribute `delay` with value `12000` and another attribute"
+        + " `delay.type` with value `integer` will cause a JMS message property `delay` to be sent as an Integer rather than a String. Supported types are boolean, byte,"
+        + " short, integer, long, float, double, and string (which is the default).")
 })
 @SeeAlso(value = { ConsumeJMS.class, JMSConnectionFactoryProvider.class })
 @SystemResourceConsideration(resource = SystemResource.MEMORY)