Update documentation with the configuration of the bearer token

Change-Id: Icb7d54620ba46e4af11f67dc35d38c784a149912

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index f29e572..d3a2859 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -518,8 +518,15 @@
 
 The optional file `$site_path/secure.config` is a Git-style config
 file that provides secure values that should not be world-readable,
-such as passwords. Passwords for HTTP remotes can be obtained from
-this file.
+such as passwords. The HTTP authentication can be configured in 2 
+different flavours:
+
+*HTTP Bearer Token Authentication*
+
+auth.bearerToken
+:	shared secret configured on all replication endpoints. 
+
+*HTTP Basic Authentication*
 
 remote.NAME.username
 :	Username to use for HTTP authentication on this remote, if not