docs: improve clarity in README

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Author: anandkaranubc

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

@@ -69,7 +69,7 @@ v = median( 10.0 );
 // returns ~0.232
 ```
 
-If provided `c <= 0`, the function returns `NaN`.
+If provided a shape parameter `c <= 0`, the function returns `NaN`.
 
 ```javascript
 var v = median( 0.0 );