docs: add note

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

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/ndarray/gsorthp/docs/repl.txt

@@ -2,6 +2,11 @@
 {{alias}}( arrays )
     Sorts a one-dimensional ndarray using heapsort.
 
+    When the sort order is less than zero, the input ndarray is sorted in
+    decreasing order. When the sort order is greater than zero, the input
+    ndarray is sorted in increasing order. When the sort order is equal to zero,
+    the input ndarray is left unchanged.
+
     The input ndarray is sorted in-place (i.e., the input ndarray is mutated).
 
     Parameters