[gnumeric] po: add xgettext advice.

[Morten Welinder <mortenw src gnome org>]

commit a849dbfae8dacc3c3c83fb4d272a243052999c40
Author: Morten Welinder <terra gnome org>
Date:   Wed Apr 7 10:01:37 2010 -0400

    po: add xgettext advice.

 plugins/fn-derivatives/options.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/fn-derivatives/options.c b/plugins/fn-derivatives/options.c
index b8289c1..7aaefeb 100644
--- a/plugins/fn-derivatives/options.c
+++ b/plugins/fn-derivatives/options.c
@@ -519,6 +519,7 @@ static GnmFuncHelp const help_opt_bs_rho[] = {
 					"on an asset with spot price @{spot}. The rho of an "
 					"option is the rate of change of its price with "
 					"respect to the risk free interest rate.")},
+	/* xgettext:no-c-format */
 	{ GNM_FUNC_HELP_NOTE, F_("Rho is expressed as the rate of change "
 				 "of the option value, per 100% change in @{rate}.")},
         { GNM_FUNC_HELP_SEEALSO, "OPT_BS,OPT_BS_DELTA,OPT_BS_THETA,OPT_BS_VEGA,OPT_BS_GAMMA"},