doc: do not use loglevel info for log category ss

The log category ss uses info as loglevel vor ss, this is to verbose,
lets use notice instead.

Change-Id: I192a5f07cb7f45adb6f3af1c511b706738bdadf4
diff --git a/doc/examples/osmo-hlr.cfg b/doc/examples/osmo-hlr.cfg
index a685858..dabfc8e 100644
--- a/doc/examples/osmo-hlr.cfg
+++ b/doc/examples/osmo-hlr.cfg
@@ -12,7 +12,7 @@
  logging level main notice
  logging level db notice
  logging level auc notice
- logging level ss info
+ logging level ss notice
  logging level linp error
 !
 line vty