l1sap.h: Fix typo in doxygen documentation

Change-Id: I5772d02704ef289945b8b70d1ebe8a8aa8b79362
diff --git a/include/osmocom/gsm/l1sap.h b/include/osmocom/gsm/l1sap.h
index 11b2773..d139690 100644
--- a/include/osmocom/gsm/l1sap.h
+++ b/include/osmocom/gsm/l1sap.h
@@ -126,7 +126,7 @@
 /*! for {ACTIVATE,DEACTIVATE,MODIFY} MPH-INFO.req */
 struct info_act_req_param {
 	uint8_t chan_nr;	/*!< Channel Number (Like RSL) */
-	uint8_t sacch_only;	/*!< \breif Only deactivate SACCH */
+	uint8_t sacch_only;	/*!< \brief Only deactivate SACCH */
 };
 
 /*! for {ACTIVATE,DEACTIVATE} MPH-INFO.cnf */