docs: fix example

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/strided/common/examples/addon-napi-polymorphic/index.js

@@ -18,17 +18,13 @@
 
 'use strict';
 
+var join = require( 'path' ).join;
+var tryRequire = require( '@stdlib/utils/try-require' );
 var Float64Array = require( '@stdlib/array/float64' );
 var Float32Array = require( '@stdlib/array/float32' ); // eslint-disable-line stdlib/require-last-path-relative
 
-var add;
-
 // Try loading the add-on:
-try {
-	add = require( './addon.node' );
-} catch ( err ) {
-	add = err;
-}
+var add = tryRequire( join( __dirname, 'addon.node' ) );
 
 /**
 * Main execution sequence.