OsmoBSC/HLR/MSC: Fix default config file name

Mention that the default is not openbsc.cfg, but osmo-*.cfg

Change-Id: I139e6004e28d6f918f31792e634214a6153edd0e
diff --git a/doc/manuals/chapters/running.adoc b/doc/manuals/chapters/running.adoc
index 44b66f2..5f24746 100644
--- a/doc/manuals/chapters/running.adoc
+++ b/doc/manuals/chapters/running.adoc
@@ -21,7 +21,7 @@
 	Fork the process as a daemon into background.
 *-c, --config-file 'CONFIGFILE'*::
 	Specify the file and path name of the configuration file to be
-	used. If none is specified, use `openbsc.cfg` in the current
+	used. If none is specified, use `osmo-hlr.cfg` in the current
 	working directory.
 *-s, --disable-color*::
 	Disable colors for logging to stderr. This has mostly been