Linker documentation patch

[Nick Clifton]

Hi Ian,

:    + Note - if the linker is being invoked indirectly, via a compiler driver
:    + (eg @samp{gcc}) then all the linker command line options should be
:    + prefixed by @samp{-Wl,}  like this:
: 
: I would change this to indicate that -Wl is actually compiler
: specific.  There are other compilers which support -Wl, but there also
: plenty which don't.

OK - I will add a sentance fragment to this effect.

Cheers
	Nick