docs: fix the description in README

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Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/bradford/median/README.md

@@ -69,13 +69,10 @@ v = median( 10.0 );
 // returns ~0.232
 ```
 
-If `c <= 0`, the function returns `NaN`.
+If provided `c <= 0`, the function returns `NaN`.
 
 ```javascript
-var v = median( NaN );
-// returns NaN
-
-v = median( 0.0 );
+var v = median( 0.0 );
 // returns NaN
 
 v = median( -1.5 );