docs: update examples

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---

Author: kgryte

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

@@ -112,7 +112,7 @@ var y = cumax( x, {
 });
 // returns <ndarray>
 
-var dt = getDType( y );
+var dt = String( getDType( y ) );
 // returns 'float64'
 ```
 

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

@@ -112,7 +112,7 @@ var y = cumin( x, {
 });
 // returns <ndarray>
 
-var dt = getDType( y );
+var dt = String( getDType( y ) );
 // returns 'float64'
 ```