docs: fix example

Author: kgryte

lib/node_modules/@stdlib/strided/base/stride2offset/lib/index.js

@@ -26,8 +26,8 @@
 * @example
 * var stride2offset = require( '@stdlib/strided/base/stride2offset' );
 *
-* var offset = stride2offset( N, -10 );
-* // returns 99
+* var offset = stride2offset( 10, -10 );
+* // returns 90
 */
 
 // MODULES //