docs: add @example JSDoc tag in process/node-version

PR-URL: #11948
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: Planeshifter

lib/node_modules/@stdlib/process/node-version/lib/main.js

@@ -30,6 +30,10 @@ var proc = require( './process.js' );
 *
 * @constant
 * @type {string}
+*
+* @example
+* console.log( VERSION );
+* // => <string>
 */
 var VERSION = proc.versions.node;