Fixes and clarifications to vos setaddrs man page

Fixes and clarifications to vos setaddrs man page

Add a caution explaining how the file server addresses are registered
and pointing users at NetInfo and NetRestrict plus restarting the file
server for the normal case.

Mention what version of OpenAFS introduced this command.  Drop the note
about the version of OpenAFS that added the -encrypt flag, since the
whole command is newer than that.

Reference vos listaddrs -printuuid specifically to get the UUID.

General formatting and wording cleanup: use terminology more consistently,
continue a long example line, wrap long lines, fix a spelling error, and
add cross-references to NetInfo and NetRestrict.

Change-Id: Idd6175339dc0feb1b777963bbb09731e42b83522
Reviewed-on: http://gerrit.openafs.org/1787
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>