fixed typo
@ -134,7 +134,7 @@ $$$
* `BetaLn(a,b)`
$$$
\ln\mathrm{B}(a,b) = \Gamma(a) + \Gamma(b) - \Gamma(a+b)
\ln\mathrm{B}(a,b) = \ln\Gamma(a) + \ln\Gamma(b) - \ln\Gamma(a+b)
#### Incomplete Beta