docs: fix error description

Author: kgryte

lib/node_modules/@stdlib/ndarray/iter/matrices/lib/main.js

@@ -45,7 +45,7 @@ var format = require( '@stdlib/string/format' );
 * @param {Options} [options] - function options
 * @param {boolean} [options.readonly=true] - boolean indicating whether returned views should be read-only
 * @throws {TypeError} first argument must be an ndarray
-* @throws {TypeError} first argument must have at least two dimensions
+* @throws {TypeError} first argument must have at least three dimensions
 * @throws {TypeError} options argument must be an object
 * @throws {TypeError} must provide valid options
 * @throws {Error} cannot write to a read-only array