logging vty: tweak general 'logging' command doc

'logging' is not only for terminals, also for stderr and other log targets.

Change-Id: If1ee59c7d1073502259b7d60008206ac3d8e87a3
diff --git a/include/osmocom/vty/logging.h b/include/osmocom/vty/logging.h
index 9bafb98..1baa3f8 100644
--- a/include/osmocom/vty/logging.h
+++ b/include/osmocom/vty/logging.h
@@ -2,7 +2,7 @@
 
 #pragma once
 
-#define LOGGING_STR	"Configure log message to this terminal\n"
+#define LOGGING_STR	"Configure logging\n"
 #define FILTER_STR	"Filter log messages\n"
 
 struct log_info;