rawmoment: small correction

Author: jvdp1

src/stdlib_experimental_stats.md

@@ -54,7 +54,7 @@ end program demo_mean
 
 Returns the _k_-th order raw moment of all the elements of `array`, or of the elements of `array` along dimension `dim` if provided, and if the corresponding element in `mask` is `true`.
 
-If an array `center` is provided, the function returns the _k_-th order central moment (about the array `center` of all the elements of `array`, or of the elements of `array` along dimension `dim` if provided, and if the corresponding element in `mask` is `true`.
+If an array `center` is provided, the function returns the _k_-th order central moment of all the elements of `array`, or of the elements of `array` along dimension `dim` if provided, and if the corresponding element in `mask` is `true`.
 
 
 The _k_-th order raw moment is defined as :