trivial: fix some incorrect compute microversion references

This patchset fixes some incorrect compute microversion references.

2.54: should have id 49 (was 4)
2.55: should have id 50 (was 49)
2.57: should have id 52 (was 51)

Change-Id: I81d90637fe16e1d5de1e26f50a86f9ff83d355ca
diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index ea868ae..e035e66 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -360,15 +360,15 @@
 
   * `2.54`_
 
-  .. _2.54: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id4
+  .. _2.54: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id49
 
   * `2.55`_
 
-  .. _2.55: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id49
+  .. _2.55: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id50
 
   * `2.57`_
 
-  .. _2.57: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id51
+  .. _2.57: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id52
 
   * `2.60`_