[sawfish] Mention --replace in the help message.

[Christopher Bratusek <chrisb src gnome org>]

commit f0dce3e6f3d3704c90c37109ea1faae8f26c2283
Author: Timo Korvola <tkorvola iki fi>
Date:   Mon Dec 27 19:51:18 2010 +0200

    Mention --replace in the help message.

 src/main.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/main.c b/src/main.c
index 379d36a..fb98eb7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -456,6 +456,7 @@ where OPTIONS are any of:\n\
 \n\
     --display=DPY	Connect to X display DPY\n\
     --multihead		Fork a copy of sawfish for each screen\n\
+    --replace		Replace the running window manager\n\
     --visual=VISUAL	Preferred visual type\n\
     --depth=DEPTH	Preferred color depth\n\
     --disable-nls	Disable internationalization of messages\n\