qga: Move type description right after type name

Documentation of type BlockdevOptionsIscsi describes the type's
purpose after its members.  Everywhere else, we do it the other way
round.  Move it for consistency.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240129115008.674248-5-armbru@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>

qapi/block-core.json

@@ -4070,6 +4070,8 @@
 ##
 # @BlockdevOptionsIscsi:
 #
+# Driver specific block device options for iscsi
+#
 # @transport: The iscsi transport type
 #
 # @portal: The address of the iscsi portal
@@ -4094,8 +4096,6 @@
 # @timeout: Timeout in seconds after which a request will timeout.  0
 #     means no timeout and is the default.
 #
-# Driver specific block device options for iscsi
-#
 # Since: 2.9
 ##
 { 'struct': 'BlockdevOptionsIscsi',