Fix wording of 'at your option' in GPL license statement

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>

diff --git a/tools/stage-marc-import.pl b/tools/stage-marc-import.pl
index d8de905..aaef903 100755 (executable)
--- a/tools/stage-marc-import.pl
+++ b/tools/stage-marc-import.pl
@@ -13,7 +13,7 @@
 #
 # Koha is free software; you can redistribute it and/or modify it under the
 # terms of the GNU General Public License as published by the Free Software
-# Foundation; either version 2 of the License, or (at your op) any later
+# Foundation; either version 2 of the License, or (at your option) any later
 # version.
 #
 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY