404 Link in Floating-Point Numbers

[jhuels]

https://en.algorithmica.org/hpc/arithmetic/float/

At the very bottom there is [the next section](https://en.algorithmica.org/hpc/arithmetic/float/ieee-754.md).

But the link should be https://en.algorithmica.org/hpc/arithmetic/ieee-754/

[sslotin]

Thanks, fixed.