doc: replay: mention no output on conflicts

Some commands will produce output on stderr if there are conflicts, but
git-replay(1) is completely silent. Explicitly spell that out.

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-replay.adoc

diff --git a/Documentation/git-replay.adoc b/Documentation/git-replay.adoc
index dcb26e8..6fbb527 100644
--- a/Documentation/git-replay.adoc
+++ b/Documentation/git-replay.adoc
@@ -81,6 +81,10 @@
 number of refs updated is always one, but for `--onto`, it can be one
 or more (rebasing multiple branches simultaneously is supported).
 
+There is no stderr output on conflicts; see the <<exit-status,EXIT
+STATUS>> section below.
+
+[[exit-status]]
 EXIT STATUS
 -----------