feat(stats/mannwhitneyu): add Mann–Whitney U test package fix-1

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Author: DivyanshuVortex

lib/node_modules/@stdlib/stats/mannwhitneyu/README.md

@@ -80,7 +80,7 @@ var out = mannWhitneyU( [ 7, 8, 9 ], [ 1, 2, 3 ], {
 By default, a two-sided test is performed. To perform either of the one-sided tests, set the `alternative` option to `less` or `greater`.
 
 ```javascript
-out = mannWhitneyU( [ 5, 6, 7, 8 ], [ 1, 2, 3, 4 ], {
+var out = mannWhitneyU( [ 5, 6, 7, 8 ], [ 1, 2, 3, 4 ], {
     'alternative': 'greater',
     'alpha': 0.05
 });