docs: update example

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/map/README.md

@@ -64,7 +64,6 @@ var oy = 0;
 
 // Create the input and output ndarray-like objects:
 var x = {
-    'ref': null,
     'dtype': 'float64',
     'data': xbuf,
     'shape': shape,