Mention SLES and openSUSE packages.

Change-Id: If4118bf48edb2a26e1ca88e194079f09811f6295
Very minor edits

Added a period (Oxygen changed spacing wrapping)

Change "Volumes" to "Block Storage service"

Change-Id: I5bdc99887b2cb08adde6fb2b6f2a9773495afd0d
Merge "Mention SLES and openSUSE packages."
Merge "Very minor edits"