docs: add missing private annotation

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Author: kgryte

lib/node_modules/@stdlib/stats/base/dists/pareto-type1/quantile/lib/native.js

@@ -28,6 +28,7 @@ var addon = require( './../src/addon.node' );
 /**
 * Evaluates the quantile function for a Pareto (Type I) distribution with shape parameter `alpha` and scale parameter `beta` at a probability `p`.
 *
+* @private
 * @param {Probability} p - input value
 * @param {PositiveNumber} alpha - shape parameter
 * @param {PositiveNumber} beta - scale parameter