docs: fix grammar

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Author: kgryte

docs/user-guides/recipes/how_to_create_an_ndarray_filled_with_random_numbers.md

@@ -118,7 +118,7 @@ const r2 = uniform.factory({
     'copy': true              // set to `false` to share state
 });
 
-// Generate the same sequence of values as if calling `uniform` a second ndarray:
+// Generate the same sequence of values as if calling `uniform` a second time:
 const z = r2( shape, a, b );
 // returns <ndarray>
 ```