DOC: fix tune.ssl.keylog sample fetches array

The labels EXPORTER_SECRET and EARLY_EXPORTER_SECRET were swapped in the
array.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 38fbbd4..3f37e0d 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -2186,8 +2186,8 @@
   SERVER_HANDSHAKE_TRAFFIC_SECRET |  %[ssl_fc_server_handshake_traffic_secret]
   CLIENT_TRAFFIC_SECRET_0         |  %[ssl_fc_client_traffic_secret_0]
   SERVER_TRAFFIC_SECRET_0         |  %[ssl_fc_server_traffic_secret_0]
-  EARLY_EXPORTER_SECRET           |  %[ssl_fc_exporter_secret]
-  EXPORTER_SECRET                 |  %[ssl_fc_early_exporter_secret]
+  EXPORTER_SECRET                 |  %[ssl_fc_exporter_secret]
+  EARLY_EXPORTER_SECRET           |  %[ssl_fc_early_exporter_secret]
 
   This is only available with OpenSSL 1.1.1, and useful with TLS1.3 session.