docs: update description

Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: Planeshifter

lib/node_modules/@stdlib/stats/incr/nanvariance/README.md

@@ -53,7 +53,7 @@ var incrnanvariance = require( '@stdlib/stats/incr/nanvariance' );
 
 #### incrnanvariance( \[mean] )
 
-Returns an accumulator `function` which incrementally computes an [unbiased sample variance][sample-variance].
+Returns an accumulator `function` which incrementally computes an [unbiased sample variance][sample-variance], ignoring `NaN` values.
 
 ```javascript
 var accumulator = incrnanvariance();

lib/node_modules/@stdlib/stats/incr/nanvariance/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@stdlib/stats/incr/nanvariance",
   "version": "0.0.0",
-  "description": "Compute an unbiased sample variance incrementally.",
+  "description": "Compute an unbiased sample variance incrementally, ignoring NaN values.",
   "license": "Apache-2.0",
   "author": {
     "name": "The Stdlib Authors",