Edits on ch_compute

Primarily improving markup, also folding some very long lines.

The troubleshooting section was a duplicate of file
ch_support-compute.xml.
Renamed ch_support-compute.xml to a section and include it
in ch_compute.

Change-Id: I78ca9e79c4219390129138990fe6c4232ff8fbb4
Rename ID since this is a URL that will be bookmarked

Let's change
http://docs.openstack.org/admin-guide-cloud/content/section_neworking-intro.html
to
... networking-intro.html

Change-Id: Idbf2ccb9a37fb373194a51577c13772434a36db0