std.math.hardware FloatingPointControl should not mention uninitialized variables

[rikkimax]

For std.math.hardware FloatingPointControl, it mentioned uninitialized values of floats.

I.e.

// Enable hardware exceptions for division by zero, overflow to infinity,
    // invalid operations, and uninitialized floating-point variables.

https://dlang.org/phobos/std_math_hardware.html#.FloatingPointControl

An uninitialized float can hold a valid value for the type. It may instead by trying to say "default-initialized" instead. However default initialized floats in D are no longer signally NaN's, they are quiet NaN's, so that would not be true either.