add link in stdlib_stats.md

Author: jvdp1

doc/specs/stdlib_stats.md

@@ -202,8 +202,8 @@ and if `n` is an odd number, the median is:
 median(array) = mean( array_sorted( floor( (n + 1) / 2.):floor( (n + 1) / 2.) + 1 ) )
 ```
 
-The array is sorted using the subroutine `ord_sort` provided by the `stdlib_sorting`
-module.
+The array is sorted using the subroutine `[[stdlib_sorting(module):ord_sort(interface)]]`
+provided by the `[[stdlib_sorting(module)]]` module.
 
 ### Syntax