docs: apply suggestions from code review

Signed-off-by: Muhammad Haris <[email protected]>

Author: headlessNode

lib/node_modules/@stdlib/ndarray/shift/README.md

@@ -127,7 +127,7 @@ arr = ndarray2array( y[ 1 ] );
 var array = require( '@stdlib/ndarray/array' );
 var ndarray2array = require( '@stdlib/ndarray/to-array' );
 var zeroTo = require( '@stdlib/array/zero-to' );
-var pop = require( '@stdlib/ndarray/pop' );
+var shift = require( '@stdlib/ndarray/shift' );
 
 // Create an ndarray:
 var x = array( zeroTo( 27 ), {