[RFA] Improve output `nm --help'

[Nick Clifton]

Hi Mark,

: 2000-07-19  Mark Kettenis  <kettenis@gnu.org>
: 
: 	* nm.c (usage): Change output of `nm --help' to include a
: 	description of the purpose of the program and a detailed
: 	description of the accepted options.

Approved and applied.

Thanks
	Nick