MINOR: server: fix doc/trace on lb algo for dynamic server creation

The text mentionned that only backends with consistent hash method were
supported for dynamic servers. In fact, it is only required that the lb
algorith is dynamic.
diff --git a/doc/management.txt b/doc/management.txt
index 1e79eb7..ce8f86c 100644
--- a/doc/management.txt
+++ b/doc/management.txt
@@ -1433,11 +1433,10 @@
   This method is still in development and may change in the future.
 
   The <server> name must not be already used in the backend. A special
-  restriction is put on the backend which must used a compatible load-balancing
-  algorithm with consistent hashing method. A subset of keywords from the
-  server config file statement can be used to configure the server behavior.
-  Also note that no settings will be reused from an hypothetical
-  'defaut-server' statement in the same backend.
+  restriction is put on the backend which must used a dynamic load-balancing
+  algorithm. A subset of keywords from the server config file statement can be
+  used to configure the server behavior. Also note that no settings will be
+  reused from an hypothetical 'default-server' statement in the same backend.
 
   Here is the list of the currently supported keywords :