VSIPL16 — cmplx function is misplaced

The cmplx() function is placed at the end of section 10.3.5, which is
otherwise about "Scalar functions and their element-wise extensions" –
but cmplx() is defined only as an element-wise function, not as a scalar
function. It does not belong in this section.

In addition, the return value is given as "The element-wise extension of
the complex(T1, T2) constructor to views." This is not the return value
– it returns a view, not a constructor! This should be clarified.