Cleaned up module001-ch004-openstack-architecture

Cleaned up run on sentence
added transition word "it" for clarity
changed process to processes, needs to be plural

Change-Id: I82e01da9b6adeab77fa76bc4555e6d08ced68977
Fixes two doc bugs with networking install and admin

- ensures network-admin/admin is redirected as people are finding it
- ensures ubuntu output has ovs install instruction

Change-Id: I22cafaae77e247d8cc2a3d01cd1bfb8320b6efb3
backport: havana
Closes-bug: 1248791
Closes-bug: 1258377
Merge "Fixes two doc bugs with networking install and admin"
Merge "Cleaned up module001-ch004-openstack-architecture"