DOC: fix incorrect indentation of http_auth_*

These ones were incorrectly indented and thus not displayed optimally
in the HTML version. This addresses issue #533.

(cherry picked from commit c9c6cdbf9c0e61ee88d68960a3220a4fcbf912cd)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit b5962b5adb53ff6cd7e81e6b83537f2c0101a830)
[wt: dropped the http_auth_* entries]
Signed-off-by: Willy Tarreau <w@1wt.eu>
diff --git a/doc/configuration.txt b/doc/configuration.txt
index b2ee835..f1a9db8 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -8584,7 +8584,7 @@
     global
       server-state-file-base /etc/haproxy/states
 
-   backend bk
+    backend bk
       load-server-state-from-file
 
   See also: "server-state-file-base", "load-server-state-from-file", and