docs: correct return type annotation in native.js

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Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/poisson/entropy/lib/native.js

@@ -30,7 +30,7 @@ var addon = require( './../src/addon.node' );
 *
 * @private
 * @param {NonNegativeNumber} lambda - mean parameter
-* @returns {number} entropy
+* @returns {PositiveNumber} entropy
 *
 * @example
 * var v = entropy( 9.0 );