chore: fix JavaScript lint errors (issue #8586)

Author: Amansingh0807

lib/node_modules/@stdlib/_tools/licenses/insert-header-file-list/lib/index.js

@@ -24,10 +24,22 @@
 * @module @stdlib/_tools/licenses/insert-header-file-list
 *
 * @example
+* var join = require( 'path' ).join;
+* var readFile = require( '@stdlib/fs/read-file' ).sync;
+* var writeFile = require( '@stdlib/fs/write-file' ).sync;
+* var unlink = require( '@stdlib/fs/unlink' ).sync;
 * var insertHeader = require( '@stdlib/_tools/licenses/insert-header-file-list' );
 *
+* // Create a temporary file:
+* var src = join( __dirname, 'examples', 'fixtures', 'file.js.txt' );
+* var tmp = join( __dirname, 'examples', 'fixtures', 'tmp.js.txt' );
+* var err = writeFile( tmp, readFile( src ) );
+* if ( err ) {
+*     throw err;
+* }
+*
 * var files = [
-*     './foo/bar.js'
+*     tmp
 * ];
 *
 * var header = '// This file is licensed under Apache-2.0.';
@@ -38,21 +50,37 @@
 *     if ( error ) {
 *         throw error;
 *     }
+*     // Remove the temporary file:
+*     unlink( tmp );
 * }
 *
 * @example
+* var join = require( 'path' ).join;
+* var readFile = require( '@stdlib/fs/read-file' ).sync;
+* var writeFile = require( '@stdlib/fs/write-file' ).sync;
+* var unlink = require( '@stdlib/fs/unlink' ).sync;
 * var insertHeader = require( '@stdlib/_tools/licenses/insert-header-file-list' );
 *
+* // Create a temporary file:
+* var src = join( __dirname, 'examples', 'fixtures', 'file.js.txt' );
+* var tmp = join( __dirname, 'examples', 'fixtures', 'tmp.js.txt' );
+* var err = writeFile( tmp, readFile( src ) );
+* if ( err ) {
+*     throw err;
+* }
+*
 * var files = [
-*     './foo/bar.js'
+*     tmp
 * ];
 *
 * var header = '// This file is licensed under Apache-2.0.';
 *
-* var err = insertHeader.sync( files, header );
+* err = insertHeader.sync( files, header );
 * if ( err instanceof Error ) {
 *     throw err;
 * }
+* // Remove the temporary file:
+* unlink( tmp );
 */
 
 // MODULES //