style: remove empty line

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

Author: kgryte

lib/node_modules/@stdlib/complex/base/cast-return/examples/index.js

@@ -29,6 +29,5 @@ var f = castReturn( addf, 2, Complex64 );
 var z = f( 3.0, 4.0 );
 // returns <Complex64>[ 7.0, 0.0 ]
 
-
 console.log( z.toString() );
 // => '7 + 0i'