docs: update example

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---

Author: kgryte

lib/node_modules/@stdlib/random/tools/unary-factory/README.md

@@ -180,7 +180,7 @@ var v = random( [ 2, 2 ], 2.0, {
 });
 // returns <ndarray>
 
-var dt = getDType( v );
+var dt = String( getDType( v ) );
 // returns 'generic'
 ```