doc: document feature of multi-sort.

* txr.1: Document that multi-sort takes a single function
in place of a list of one function. This has been a feature of
the implementation from the beginning.

1 files changed, 4 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index e8fd0eeb..5c98279e 100644
--- a/txr.1
+++ b/txr.1
@@ -21677,6 +21677,10 @@ one compare
 .codn equal ,
 then the corresponding second column elements are compared
 using the second column comparison function.
+The
+.meta less-funcs
+argument may be a function object, in which case it is treated as if
+it were a one-element list containing that function object.
 
 The optional
 .meta key-funcs