Update the discovery settings for the 5.26.2 release

Author: NataliaIvakina

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

@@ -365,6 +365,8 @@ m|+++10m+++
 |===
 |Description
 a|A comma-separated list of endpoints that a server should contact in order to discover other cluster members.
+All cluster members hosting a system database primary must be specified in this list.
+However, it is typical that all cluster members, including the current server, are specified in this list.
 The setting configures the endpoints for Discovery service V1.
 |Valid values
 a|A comma-separated list where each element is a socket address in the format of `hostname:port`, `hostname`, or `:port`.
@@ -381,6 +383,8 @@ m|
 |===
 |Description
 a|A comma-separated list of endpoints that a server should contact in order to discover other cluster members.
+All cluster members hosting a system database primary must be specified in this list.
+However, it is typical that all cluster members, including the current server, are specified in this list.
 The setting configures the endpoints for Discovery service V2.
 |Valid values
 a|A comma-separated list where each element is a socket address in the format of `hostname:port`, `hostname`, or `:port`.
@@ -412,6 +416,8 @@ Possible values are:
 * `V2_OVER_V1` -- it runs both Discovery Service V1 and Discovery Service V2, where V2 is the main service and V1 runs in the background.
 
 * `V2_ONLY` -- it runs only discovery service v2.
+
+This setting is deprecated because in the next major version it is removed, since there will only be the V2 discovery service.
 |Valid values
 a|One of [V1_ONLY, V1_OVER_V2, V2_OVER_V1, V2_ONLY].
 |Default value