fix api doc typo for osmo_plmn_name2()

Change-Id: Ic2652c7e4ffe1e707022168ac6c0da7c88ae7f45
diff --git a/src/gsm/gsm23003.c b/src/gsm/gsm23003.c
index 95fca91..720c09b 100644
--- a/src/gsm/gsm23003.c
+++ b/src/gsm/gsm23003.c
@@ -129,7 +129,7 @@
 	return buf;
 }
 
-/*! Same as osmo_mcc_mnc_name(), but returning in a different static buffer.
+/*! Same as osmo_plmn_name(), but returning in a different static buffer.
  * \param[in] plmn  MCC-MNC value.
  * \returns string in static buffer.
  */