textproc/aspell: garbage-collect DOCS option (now useless)

As of r332672, manpages are always installed and condition
.if ${PORT_OPTIONS:MDOCS} had been removed; since the port
does not install any other documentation, drop it from the
option list as well. While here, sort INFO alphabetically
and GC the linking gimmick added for version 0.50.4.1 back
in 2003 (r94146, now commit ed1d8c2ac3336): these days, it
builds and links fine regardless of the optimization level.

PR: 252357
Fixes: f027257d68fb6