qapi-schema: Remove obsolete note from ObjectTypeInfo

The "This command is experimental" note in ObjectTypeInfo is obsolete
since 2012.  Commit 5192082097549c5b3aa7c913c6853d97a68172cb removed the
warning from the qom-list-types command documentation, but we forgot to
remove the warning from ObjectTypeInfo.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170516205351.12101-1-ehabkost@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

qapi-schema.json

@@ -3035,8 +3035,6 @@
 # @name: the type name found in the search
 #
 # Since: 1.1
-#
-# Notes: This command is experimental and may change syntax in future releases.
 ##
 { 'struct': 'ObjectTypeInfo',
   'data': { 'name': 'str' } }