Miscellaneous doc fixes -- Part 1

index.rst -- fixed "Pre-Installation" string and modified description
  so it doesn't say "you must execute" for the Planning Guide.

pre-install
- 0010-intro -- moved virtualbox piece to end; small edits
- 4000-planning-summary - small edit, deleted "Prepare logical network
  diagram" line since we have no info for that
- 4200-net-topology -- fixed typos
- 4300-linux-distro -- added link to "VLAN splinters" in user-guide
- 4400-nodes-roles
  - added link to "Assigning nodes to roles" in user-guide
  - fixed bad link to virtualbox-top
  - reworded lead in to larger list of nodes
  - augmented note about not running Ceph OSD on controllers with
    a note to not run Ceph OSD and Ceph Mon on same storage node.

ref-arch
- storage/0000-storage-intro had tag with _; changed to -
- logical-setup/0400-storage-nodes linked to the tag in storage/0000-*
  so I fixed that.  Found a couple typos in the file so fixed those
  and added links to Ceph, Cinder, and Swift articles in terminology.

terminology
- bonding -- links to ovs, user guide instructions
- ceilometer -- link to mongodb article
- ceph -- added info about Ceph Mon and Ceph OSD not running on same server
- compute nodes -- link to ref-arch section

user-guide
- 2000-deploy-new -- added info about remote control utility in response
  to Miroslav comment https://review.openstack.org/#/c/95386.
-  "  "  -- added link to vcenter-term on Hypervisor page

Note that the number of PDF build errors has escalated significantly.
This is also the case for Jenkins builds done last night and this morning.
I think it is related to issues with xrefs to titles.  I will continue
to investigate.

Change-Id: Iceecab3fee095b8eb5d1b9139c6faa8faa5f7fad