chore: update markdown example

Signed-off-by: Shabareesh Shetty <[email protected]>

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/dzasum/README.md

@@ -157,15 +157,20 @@ var filledarrayBy = require( '@stdlib/array/filled-by' );
 var dzasum = require( '@stdlib/blas/base/dzasum' );
 
 function rand() {
-    return new Complex128( discreteUniform( 0, 10 ), discreteUniform( -5, 5 ) );
+	return new Complex128( discreteUniform( 0, 10 ), discreteUniform( -5, 5 ) );
 }
 
 // Generate random input arrays:
 var x = filledarrayBy( 10, 'complex128', rand );
 console.log( x.toString() );
 
+// Compute the sum of the absolute values of each element:
 var out = dzasum( x.length, x, 1 );
 console.log( out );
+
+// Compute the sum of the absolute values of each element using alternative indexing semantics:
+out = dzasum.ndarray( x.length, x, 1, 0 );
+console.log( out );
 ```
 
 </section>