[fortran, documentation] Fix HOSTNM, add SLEEP intrinsic

[Daniel Franke]

This patch fixes a typographical error in the documentation of the HOSTNM 
intrinsic and adds the implemented, but not yet documented SLEEP subroutine.


2007-02-11  Daniel Franke  <franke.daniel@gmail.com>

        * intrinsic.texi (HOSTNM): Fix typographical error in syntax.
        (SLEEP): Added section and documentation.


Tested info and dvi targets on i686-pc-linux-gnu.

Ok for mainline?

	Daniel
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