[fortran, patch, committed] Backport COMPLEX documentation to 4.2

[Brooks Moses]

As attached, including ChangeLog entry.  Thanks again to Tobias Burnus 
for poking at me in the PR to make sure I didn't forget this!

Tested with "make doc/gfortran.pdf" and "make doc/gfortran.info" on 
i686-pc-linux-gnu.

- Brooks
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