Change OpenBSC mentions to OsmoBSC where applicable

Change-Id: I4cc6874302b6089a54d44b09f08660a25e46d4dc
diff --git a/doc/manuals/gb/bssgp.adoc b/doc/manuals/gb/bssgp.adoc
index fe30d84..18f1842 100644
--- a/doc/manuals/gb/bssgp.adoc
+++ b/doc/manuals/gb/bssgp.adoc
@@ -490,7 +490,7 @@
 described in <<ns_init>>.
 
 OsmoPCU allocates a BVC context for the BVCI given by OsmoBTS, which
-in turn receives it from OpenBSC via OML procedures.
+in turn receives it from OsmoBSC or OsmoNITB via OML procedures.
 
 In addition to the BVCI identifying the OsmoPCU side of BSSGP
 connection, there is also special BVCI which is accepted by OsmoPCU in