docs: update example

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---

Author: kgryte

lib/node_modules/@stdlib/random/exponential/README.md

@@ -167,7 +167,7 @@ var opts = {
 };
 var random = exponential.factory( opts );
 
-var out = random( [ 3, 3 ], 2.0, opts );
+var out = random( [ 3, 3 ], 2.0 );
 // returns <ndarray>
 ```