docs: improve clarity in README

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Author: anandkaranubc

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

@@ -88,7 +88,7 @@ y = quantile( -1.0, 0.5 );
 // returns NaN
 ```
 
-If provided `c <= 0`, the function returns `NaN`.
+If provided a shape parameter `c <= 0`, the function returns `NaN`.
 
 ```javascript
 var y = quantile( 0.5, 0.0 );