SLO docs(tring): manifest params in table, code block; copyedits
SLO docs(tring): manifest params in table, code block; copyedits

It's æsthetically pleasing to display the segment description parameters
in a table (using the reStructuredText "simple" table markup) and to use
a code block (which receives syntax hightlighting in the rendered
document!) for the example JSON fragment. Also, a few very minor copy
changes are made (a comma after an introductory phrase clarifies; JSON
and ETag receieve their canonical capitalizations; the elements of the
manifest JSON aren't "files" exactly; the inclusive nature of the range
is noted for the benefit of harried readers who won't read the "Range
Specification" section later in the document).

Change-Id: I5296fc04c6fe5410ad14bba7de0a7f8ab060b126

tipabu/swift,thiagodasilva/swift,hurricanerix/swift,prashanthpai/swift,hurricanerix/swift,rackerlabs/swift,levythu/swift,smerritt/swift,notmyname/swift,tipabu/swift,hurricanerix/swift,matthewoliver/swift,levythu/swift,clayg/swift,larsbutler/swift,revoer/keystone-8.0.0,nadeemsyed/swift,hurricanerix/swift,swiftstack/swift,aerwin3/swift,psachin/swift,openstack/swift,matthewoliver/swift,clayg/swift,notmyname/swift,nadeemsyed/swift,williamthegrey/swift,openstack/swift,clayg/swift,redbo/swift,bkolli/swift,daasbank/swift,mjwtom/swift,notmyname/swift,aerwin3/swift,smerritt/swift,larsbutler/swift,redbo/swift,swiftstack/swift,tipabu/swift,thiagodasilva/swift,smerritt/swift,smerritt/swift,nadeemsyed/swift,psachin/swift,bkolli/swift,clayg/swift,matthewoliver/swift,psachin/swift,matthewoliver/swift,williamthegrey/swift,swiftstack/swift,psachin/swift,notmyname/swift,daasbank/swift,revoer/keystone-8.0.0,mjwtom/swift,openstack/swift,tipabu/swift,prashanthpai/swift,nadeemsyed/swift,openstack/swift,rackerlabs/swift