docs: update copy

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/ndarray/flatten/docs/repl.txt

@@ -30,8 +30,8 @@
         Default: 'row-major'.
 
     options.dtype: string (optional)
-        Output ndarray data type. Overrides using the input array's inferred
-        data type.
+        Output ndarray data type. By default, the function returns an ndarray
+        having the same data type as the provided input ndarray.
 
     Returns
     -------