docs: fix example

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/unary-reduce-subarray-by/docs/repl.txt

@@ -76,15 +76,15 @@
     ... };
 
     // Using minimal ndarray-like objects...
-    > x = {
+    > var x = {
     ...     'dtype': dtype,
     ...     'data': xbuf,
     ...     'shape': shx,
     ...     'strides': sx,
     ...     'offset': ox,
     ...     'order': order
     ... };
-    > y = {
+    > var y = {
     ...     'dtype': dtype,
     ...     'data': ybuf,
     ...     'shape': shy,