Clarify pg_rewind connection requirements.

Per http://www.postgresql.org/message-id/flat/564C4CE6.9000509@postgrespro.ru
Pavel Luzanov 

diff --git a/doc/src/sgml/ref/pg_rewind.sgml b/doc/src/sgml/ref/pg_rewind.sgml
index 9cdfa902f5acfcdeb2442a4f21e7acc404974564..ef0cc280d14bc455614b7a3b0623a122ddfab8f4 100644 (file)
--- a/doc/src/sgml/ref/pg_rewind.sgml
+++ b/doc/src/sgml/ref/pg_rewind.sgml
@@ -130,7 +130,9 @@ PostgreSQL documentation
        
         Specifies a libpq connection string to connect to the source
         PostgreSQL server to synchronize the target with.
-        The server must be up and running, and must not be in recovery mode.
+        The connection must be a normal (non-replication) connection 
+        with superuser access. The server must be up and running, 
+        and must not be in recovery mode.