docs: update example to match docs

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/blas/base/wasm/scasum/README.md

@@ -101,8 +101,8 @@ var Complex64Array = require( '@stdlib/array/complex64' );
 
 var x = new Complex64Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] );
 
-var sum = scasum.ndarray( 2, x, 1, x.length-2 );
-// returns 8.0
+var sum = scasum.ndarray( 3, x, 1, x.length-2 );
+// returns 16.0
 ```
 
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