application.c: drop wrong \references of osmo_init_ignore_signals()

Change-Id: Ib08e15dd5d811662de46a1dfdb676b9a5b66b529
diff --git a/src/application.c b/src/application.c
index d912eb7..7fd6280 100644
--- a/src/application.c
+++ b/src/application.c
@@ -89,7 +89,7 @@
 	log_targets_reopen();
 }
 
-/*! Ignore \ref SIGPIPE, \ref SIGALRM, \ref SIGHUP and \ref SIGIO */
+/*! Ignore SIGPIPE, SIGALRM, SIGHUP and SIGIO */
 void osmo_init_ignore_signals(void)
 {
 	/* Signals that by default would terminate */