docs: fix type

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---

Author: kgryte

lib/node_modules/@stdlib/array/base/join/lib/main.js

@@ -129,7 +129,7 @@ function indexed( x, separator ) {
 * Returns a string created by joining array elements using a specified separator.
 *
 * @param {Collection} x - input array
-* @param {integer} separator - separator
+* @param {string} separator - separator
 * @returns {string} output string
 *
 * @example