Follow Unix idioms and the guidelines presented in groff_man_style(7).[1]
* Present multiple synopses since the command has multiple operation
modes accessed via mutually inexpressible command letters. See the
POSIX standard for copious precedent.
* Stop implying that file name arguments are accepted alongside the `I`
option; see line 236 of util/dlb_main.c.
* Stop spacing around synopsis punctuation where unnecessary.
* Set metasyntactic variables (parameters) in italics, not roman or
bold.
* Spell ellipsis idiomatically for pleasant typesetting.
* Use `\c` escape sequence to force adjacency of tar-like option letters
to the mandatory operation letter.
* Use singular, not plural, for repeatable argument. The ellipsis does
the grammatical work of pluralization for us.
[1] Full disclosure: I wrote much of (the current form of) that man page.
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