[master] Correct v6 classification examples to use the correct option tag

ChangeLog

+10XX.	[doc]		sar
+	Correct v6 classification examples to use client-id (1) instead
+	of server-id (2).
+	(Trac #4222, git TBD)
+
 1069.	[bug]		tomek
 	Improved handling of incoming packets with invalid client-id
 	and DUID.

doc/guide/classify.xml

@@ -298,7 +298,7 @@
     "client-classes": [<userinput>
         {
             "name": "Client_enterprise",
-            "test": "substring(option[2].hex,0,6) == 0x0002AABBCCDD'",
+            "test": "substring(option[1].hex,0,6) == 0x0002AABBCCDD'",
             "option-data": [
                 {
                     "name": "dns-servers",
@@ -371,7 +371,7 @@
     "client-classes": [
         {
             "name": "Client_enterprise",
-            "test": "substring(option[2].hex,0,6) == 0x0002AABBCCDD'",
+            "test": "substring(option[1].hex,0,6) == 0x0002AABBCCDD'",
             "option-data": [
                 {
                     "name": "dns-servers",

doc/guide/dhcp6-srv.xml

@@ -1692,7 +1692,7 @@ should include options from the isc option space:
     "client-classes": [
         {<userinput>
             "name": "Client_enterprise",
-            "test": "substring(option[2].hex,0,6) == 0x0002AABBCCDD'",
+            "test": "substring(option[1].hex,0,6) == 0x0002AABBCCDD'",
             "option-data": [
                 {
                     "name": "dns-servers",