Fix the test and update descr of dbms.routing.load_balancing.plugin

Author: NataliaIvakina

modules/ROOT/pages/configuration/configuration-settings.adoc

@@ -1697,9 +1697,9 @@ m|+++true+++
 [frame="topbot", stripes=odd, grid="cols", cols="<1s,<4"]
 |===
 |Description
-a|The load balancing plugin to use.
+a|Vary the order of the entries in routing tables each time one is produced. This means that different clients should select a range of servers as their first contact, reducing the chance of all clients contacting the same server if alternatives are available. This makes the load across the servers more even.
 |Valid values
-a|A string that specified load balancer plugin exist..
+a|A string.
 |Default value
 m|+++server_policies+++
 |===
@@ -4808,7 +4808,7 @@ m|+++127.0.0.1:6362+++
 |Description
 a|The advertised address for the backup server. Default is the default advertised address combined with port defined in the backup listen address.
 |Valid values
-a|A socket address in the format of `hostname:port`, `hostname`, or `:port`.
+a|A socket address in the format of `hostname:port`, `hostname`, or `:port` that is an accessible address. If missing, it is acquired from `server.default_advertised_address`.
 |Default value
 m|+++0+++
 |===