This is to be consistent with other manuals:
- no period punctuation at end
- no capitalization at beginning unless acronym or proper noun
- and no simple article (like "A") to start sentence.
While the docbook specification says refpurpose is a "one sentence",
its examples show it with the rules shown above.
Also compared with many manpages as this is common format for the
.Nd macro's one line description.
of individual resource records. This tool is intended
to be called by provisioning systems so that the front
end does not need to be upgraded to support new DNS
record types. [RT #34778]
