Explain meaning of stacked paragraph tags naming environment variables.
Drop call of deprecated man(7) `DT` macro and invocation of `ta` request
to set tab stops to attempt table-like layout. (The latter made the
former nilpotent anyway.) Replace this material with calls of tagged
paragraphing macro `TP` and groff man(7)'s `TQ` extension for setting
multiple tags with a paragraph. The result takes up more screen lines,
but renders well with more formatters.
Set indentation of tagged paragraph using a constant numeric expression
to accommodate pseudo-roff formatters that don't implement arithmetic
evaluation. (Some of these ignore _any_ indentation, regardless.)
Slightly recast descriptions of environment variables.
Set file name literals in italics.
Protect file and environment variable names from hyphenation.
Fixes:
an.tmac:doc/nethack.6:608: style: use of deprecated macro: .DT
G. Branden Robinson
d2a49d4f8a