fix: Update docs

Updates `getting-started.md` to match how tracing has been tested.

Signed-off-by: Jonathan Woollett-Light <jcawl@amazon.co.uk>

Author: Jonathan Woollett-Light

docs/getting-started.md

@@ -143,7 +143,8 @@ curl -X PUT --unix-socket "${API_SOCKET}" \
         \"log_path\": \"${LOGFILE}\",
         \"level\": \"Debug\",
         \"show_level\": true,
-        \"show_log_origin\": true
+        \"show_log_origin\": true,
+        \"new_format\": true
     }" \
     "http://localhost/logger"