examples: remove logging level * everything

Option "logging level ... everything" is broken for quite some time and
might be deprecated in future. Replace it with "logging level ... debug"
in config examples.

Change-Id: I828ef7671b4fb38717526a18ff8e9a5428cd511e
Related: OS#71
diff --git a/openbsc/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg b/openbsc/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg
index 566258e..15fd74a 100644
--- a/openbsc/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg
+++ b/openbsc/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg
@@ -6,7 +6,7 @@
   logging filter all 1
   logging color 1
   logging timestamp 0
-  logging level all everything
+  logging level all debug
   logging level gprs debug
   logging level ns info
   logging level bssgp debug