fix: parameter types

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Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/bradford/median/lib/main.js

@@ -29,8 +29,8 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 /**
 * Returns the median of a Bradford distribution.
 *
-* @param {number} c - shape parameter
-* @returns {number} median
+* @param {PositiveNumber} c - shape parameter
+* @returns {PositiveNumber} median
 *
 * @example
 * var v = median( 0.1 );