Fixed wrong link in microversion_testing.rst

Change-Id: Id457dce3cbe59a2d675fc199dc4c015b1248ba01
diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index e7f71bc..572d425 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -246,4 +246,4 @@
 
  * `2.42`_
 
- .. _2.42: http://docs.openstack.org/developer/nova/api_microversion_history.html#id38
+ .. _2.42: http://docs.openstack.org/developer/nova/api_microversion_history.html#maximum-in-ocata