docs: update example

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/ndarray/count-truthy/docs/repl.txt

@@ -68,6 +68,8 @@
     > var y = {{alias:@stdlib/ndarray/from-scalar}}( 0, { 'dtype': 'int32' } );
     > var out = {{alias}}.assign( x, y )
     <ndarray>[ 3 ]
+    > var bool = ( out === y )
+    true
 
     See Also
     --------