refactor: rename parameters in kurtosis

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Author: gururaj1512

lib/node_modules/@stdlib/stats/base/dists/weibull/kurtosis/lib/native.js

@@ -61,8 +61,8 @@ var addon = require( './../src/addon.node' );
 * var v = kurtosis( NaN, 2.0 );
 * // returns NaN
 */
-function kurtosis( alpha, beta ) {
-	return addon( alpha, beta );
+function kurtosis( k, lambda ) {
+	return addon( k, lambda );
 }