hmp-commands-info: Move Texinfo stanzas to conventional place

A command's STEXI..ETEXI stanza follows the command's initializer.
Two commands got them backwards.  Correct that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20171002134538.23332-3-armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

hmp-commands-info.hx

@@ -835,12 +835,6 @@ STEXI
 @item info hotpluggable-cpus
 @findex hotpluggable-cpus
 Show information about hotpluggable CPUs
-ETEXI
-
-STEXI
-@item info vm-generation-id
-@findex vm-generation-id
-Show Virtual Machine Generation ID
 ETEXI
 
     {
@@ -852,10 +846,9 @@ ETEXI
     },
 
 STEXI
-@item info memory_size_summary
-@findex memory_size_summary
-Display the amount of initially allocated and present hotpluggable (if
-enabled) memory in bytes.
+@item info vm-generation-id
+@findex vm-generation-id
+Show Virtual Machine Generation ID
 ETEXI
 
     {
@@ -867,6 +860,13 @@ ETEXI
         .cmd        = hmp_info_memory_size_summary,
     },
 
+STEXI
+@item info memory_size_summary
+@findex memory_size_summary
+Display the amount of initially allocated and present hotpluggable (if
+enabled) memory in bytes.
+ETEXI
+
 STEXI
 @end table
 ETEXI