docs: update desc

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/nanrange-by/README.md

@@ -195,7 +195,7 @@ var dt = String( getDType( y ) );
 
 #### nanrangeBy.assign( x, out\[, options], clbk\[, thisArg] )
 
-Computes the [**range**][range] along one or more [ndarray][@stdlib/ndarray/ctor] dimensions according to a callback function and assigns results to a provided output [ndarray][@stdlib/ndarray/ctor].
+Computes the [**range**][range] along one or more [ndarray][@stdlib/ndarray/ctor] dimensions according to a callback function, ignoring `NaN` values, and assigns results to a provided output [ndarray][@stdlib/ndarray/ctor].
 
 ```javascript
 var array = require( '@stdlib/ndarray/array' );