doc: link to nova code review guide from dev policies

The development policies section on code review was linking to the
generic openstack review guidelines but we have nova-specific
guidelines as well so this changes the policies page to link to the
nova code review guidelines, links the general guidelines into the
nova page, and also fixes a formatting issue in the nova code review
guidelines page.

Change-Id: I725570d0d737f18fe8b105dc8382c4abcfdef295

doc/source/contributor/code-review.rst

@@ -4,7 +4,10 @@
 Code Review Guide for Nova
 ==========================
 
-This is a very terse set of points for reviewers to consider when
+OpenStack has a general set of code review guidelines:
+https://docs.openstack.org/infra/manual/developers.html#peer-review
+
+What follows is a very terse set of points for reviewers to consider when
 looking at nova code. These are things that are important for the
 continued smooth operation of Nova, but that tend to be carried as
 "tribal knowledge" instead of being written down. It is an attempt to
@@ -22,7 +25,7 @@ RPC API Versions
 
   * The manager-side (example: compute/manager) needs a version bump
   * The manager-side method needs to tolerate older calls as well as
-      newer calls
+    newer calls
   * Arguments can be added as long as they are optional. Arguments
     cannot be removed or changed in an incompatible way.
   * The RPC client code (example: compute/rpcapi.py) needs to be able

doc/source/contributor/policies.rst

@@ -59,7 +59,7 @@ As a patch author, you should try to offset the reviewer resources
 spent on your patch by reviewing other patches. If no one does this, the review
 team (cores and otherwise) become spread too thin.
 
-For review guidelines see: https://docs.openstack.org/infra/manual/developers.html#peer-review
+For review guidelines see: :doc:`code-review`
 
 Reverts for Retrospective Vetos
 ===============================