docs: fix description

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/array/nanstdevch/docs/repl.txt

@@ -14,7 +14,7 @@
         Degrees of freedom adjustment. Setting this parameter to a value other
         than `0` has the effect of adjusting the divisor during the calculation
         of the standard deviation according to `N-c` where `N` corresponds to
-        the number of array elements and `c` corresponds to the provided
+        the number of non-NaN array elements and `c` corresponds to the provided
         degrees of freedom adjustment. When computing the standard deviation of
         a population, setting this parameter to `0` is the standard choice
         (i.e., the provided array contains data constituting an entire