docs: update example

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Author: kgryte

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

@@ -46,6 +46,7 @@ Returns an array containing a truncated view of an input ndarray and a view of t
 
 ```javascript
 var ndarray = require( '@stdlib/ndarray/ctor' );
+var getShape = require( '@stdlib/ndarray/shape' );
 var ndarray2array = require( '@stdlib/ndarray/to-array' );
 
 var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
@@ -56,7 +57,7 @@ var offset = 0;
 var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
 // returns <ndarray>
 
-var sh = x.shape;
+var sh = getShape( x );
 // returns [ 3, 2 ]
 
 var arr = ndarray2array( x );