docs: fix missing annotation

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---

Author: kgryte

lib/node_modules/@stdlib/array/index/lib/main.js

@@ -46,6 +46,7 @@ var generateId = require( './id.js' );
 /**
 * Array index constructor.
 *
+* @constructor
 * @param {Collection} x - input array
 * @param {Options} [options] - function options
 * @param {boolean} [options.persist=false] - boolean indicating whether to continue persisting an index object after first usage