docs: update JSDoc and example

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Author: gururaj1512

lib/node_modules/@stdlib/stats/base/variancetk/lib/main.js

@@ -27,19 +27,18 @@ var ndarray = require( './ndarray.js' );
 // MAIN //
 
 /**
-* Computes the variance of a strided array.
+* Computes the variance of a strided array using a one-pass textbook algorithm.
 *
 * @param {PositiveInteger} N - number of indexed elements
-* @param {PositiveInteger} correction - degrees of freedom adjustment
+* @param {number} correction - degrees of freedom adjustment
 * @param {NumericArray} x - input array
 * @param {integer} strideX - stride length
 * @returns {number} variance
 *
 * @example
 * var x = [ 1.0, -2.0, 2.0 ];
-* var N = x.length;
 *
-* var v = variancetk( N, 1, x, 1 );
+* var v = variancetk( x.length, 1, x, 1 );
 * // returns ~4.3333
 */
 function variancetk( N, correction, x, strideX ) {