frexp man page: FLT_RADIX vs. 2

[Morten Welinder <mwelinder@xxxxxxxxx>]

A very minor bug:

The main body of frexp's man page says the exponent returned is for a
power of two. That agrees with, for example, the C99 standard as well
as https://en.cppreference.com/w/cpp/numeric/math/frexp

However, the sample program in the man page uses FLT_RADIX.  The value
of that macro need not be 2 so the man page should be changed to use 2
directly.

M.