add: add a blank line at the end of pathless 'add [-u|-A]' warning

When the commands give an actual output (e.g. when ran with -v), the
output is visually mixed with the warning.

An additional blank line makes the actual output more visible.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/add.c

@@ -57,7 +57,9 @@ static void warn_pathless_add(void)
 		  "  git add %s .\n"
 		  "  (or git add %s .)\n"
 		  "\n"
-		  "With the current Git version, the command is restricted to the current directory."),
+		  "With the current Git version, the command is restricted to "
+		  "the current directory.\n"
+		  ""),
 		option_with_implicit_dot, short_option_with_implicit_dot,
 		option_with_implicit_dot, short_option_with_implicit_dot,
 		option_with_implicit_dot, short_option_with_implicit_dot);