docs: update example

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

Author: kgryte

lib/node_modules/@stdlib/blas/ext/last-index-of/README.md

@@ -89,11 +89,11 @@ var x = array( [ 1.0, 2.0, 3.0, 4.0, 2.0, 6.0 ] );
 // returns <ndarray>
 
 // Perform operation:
-var out = lastIndexOf( x, 2.0, 5 );
+var out = lastIndexOf( x, 2.0, 3 );
 // returns <ndarray>
 
 var idx = out.get();
-// returns 4
+// returns 2
 ```
 
 By default, the function performs the operation over elements in the last dimension. To perform the operation over a different dimension, provide a `dim` option.