Documentation for acosh states an incorrect range.

**Where?**
https://sleef.org/2-references/libm/#sleef_acosh_u10

**What?**
This is a very minor point, but in the description for `acosh` it states ranges of `[-1.34e+154, 1.34e+154]` for double precision and `[-1.84e+19, 1.84e+19]` for single precision. However the `acosh` function is only defined for values greater than 1.

**How?**
Change the lower bounds in the description to 1.