doc: Correct typo
doc: Correct typo

We're talking mathematical symbols here, not precious metals /o\

Change-Id: Ie47feab31232d100da48be095feeae37c5f51a70
Signed-off-by: Stephen Finucane <4725dc7f3632bf126d9fbdc30c347e91e8d2fe16@redhat.com>

openstack/nova,mahak/nova,openstack/nova,klmitch/nova,klmitch/nova,klmitch/nova,mahak/nova,klmitch/nova,openstack/nova,mahak/nova