chore: add TODO

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/unary-reduce-subarray/README.md

@@ -107,6 +107,8 @@ Each provided ndarray should be an object with the following properties:
 -   **offset**: index offset.
 -   **order**: specifies whether an ndarray is row-major (C-style) or column major (Fortran-style).
 
+#### TODO: document factory method
+
 </section>
 
 <!-- /.usage -->