feat: add sstdevtk to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/lib/index.js

@@ -1332,6 +1332,15 @@ setReadOnly( ns, 'sstdevch', require( '@stdlib/stats/base/ndarray/sstdevch' ) );
 */
 setReadOnly( ns, 'sstdevpn', require( '@stdlib/stats/base/ndarray/sstdevpn' ) );
 
+/**
+* @name sstdevtk
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/sstdevtk}
+*/
+setReadOnly( ns, 'sstdevtk', require( '@stdlib/stats/base/ndarray/sstdevtk' ) );
+
 /**
 * @name sstdevwd
 * @memberof ns