[Patch/ld] Tweak doc of --heap, --stack ld options

[Nick Clifton]

Hi Danny,

> 2007-07-05  Danny Smith  <dannysmith@users.sourceforge.net>
> 
> 	* ld.texinfo (--heap): Replace 'amount' with 'number of bytes'.
> 	(--stack): Likewise.

Approved - please apply.

Cheers
   Nick