DOC: re-work log forward bind statement documentation.

This patch re-work the documentation about the bind statement
of log forward section.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 3eaed64..3054b1c 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -2785,8 +2785,10 @@
 
 bind <addr> [param*]
   Used to configure a stream log listener to receive messages to forward.
-  This supports for some of the "bind" parameters found in 5.1 paragraph.
-  Those listener support both "Octet Counting" and "Non-Transparent-Framing"
+  This supports the "bind" parameters found in 5.1 paragraph including
+  those about ssl but some statements such as "alpn" may be irrelevant for
+  syslog protocol over TCP.
+  Those listeners support both "Octet Counting" and "Non-Transparent-Framing"
   modes as defined in rfc-6587.
 
 dgram-bind <addr> [param*]