comment and VTY doc tweaks

Clarify some in-code comments.

Fix descriptions of some handover timers, which still talked of "MO" and "MT"
handover -- which we now call "inter-BSC out" or "inter-BSC in" instead.

Change-Id: I8429a830edd0325893ac90f22fcc05309617bd2d
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index a464001..d82d1ba 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -1505,7 +1505,7 @@
 	struct llist_head bts_list;
 	struct llist_head bts_rejected;
 
-	/* shall reference gsm_network_T[] */
+	/* see gsm_network_T_defs */
 	struct osmo_tdef *T_defs;
 
 	enum gsm_chan_t ctype_by_chreq[_NUM_CHREQ_T];