Fix list rendering in code-review.rst
Fix list rendering in code-review.rst

Sub lists have to be indented exactly 2 additional spaces from their
parent, otherwise it is treated as a blockquote, which isn't what we
want.

Part of bp: doc-migration

Change-Id: Iab46b5e39e4bd0d154f33dc795f24362c77a88a5

mikalstill/nova,phenoxim/nova,mikalstill/nova,rahulunair/nova,vmturbo/nova,rahulunair/nova,klmitch/nova,jianghuaw/nova,klmitch/nova,vmturbo/nova,vmturbo/nova,openstack/nova,openstack/nova,vmturbo/nova,mahak/nova,jianghuaw/nova,gooddata/openstack-nova,gooddata/openstack-nova,klmitch/nova,gooddata/openstack-nova,openstack/nova,mahak/nova,gooddata/openstack-nova,jianghuaw/nova,rahulunair/nova,mahak/nova,phenoxim/nova,jianghuaw/nova,mikalstill/nova,klmitch/nova