Update Jwt Multi-tenancy Documentation

Issue gh-13427

docs/modules/ROOT/pages/reactive/oauth2/resource-server/multitenancy.adoc

@@ -23,8 +23,8 @@ Java::
 +
 [source,java,role="primary"]
 ----
-JwtIssuerReactiveAuthenticationManagerResolver authenticationManagerResolver = new JwtIssuerReactiveAuthenticationManagerResolver
-    ("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo");
+JwtIssuerReactiveAuthenticationManagerResolver authenticationManagerResolver = JwtIssuerReactiveAuthenticationManagerResolver
+    .fromTrustedIssuers("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo");
 
 http
     .authorizeExchange(exchanges -> exchanges
@@ -39,7 +39,8 @@ Kotlin::
 +
 [source,kotlin,role="secondary"]
 ----
-val customAuthenticationManagerResolver = JwtIssuerReactiveAuthenticationManagerResolver("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo")
+val customAuthenticationManagerResolver = JwtIssuerReactiveAuthenticationManagerResolver
+    .fromTrustedIssuers("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo")
 
 return http {
     authorizeExchange {

docs/modules/ROOT/pages/servlet/oauth2/resource-server/multitenancy.adoc

@@ -114,8 +114,8 @@ Java::
 +
 [source,java,role="primary"]
 ----
-JwtIssuerAuthenticationManagerResolver authenticationManagerResolver = new JwtIssuerAuthenticationManagerResolver
-    ("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo");
+JwtIssuerAuthenticationManagerResolver authenticationManagerResolver = JwtIssuerAuthenticationManagerResolver
+    .fromTrustedIssuers("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo");
 
 http
     .authorizeHttpRequests(authorize -> authorize
@@ -131,7 +131,7 @@ Kotlin::
 [source,kotlin,role="secondary"]
 ----
 val customAuthenticationManagerResolver = JwtIssuerAuthenticationManagerResolver
-    ("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo")
+    .fromTrustedIssuers("https://idp.example.org/issuerOne", "https://idp.example.org/issuerTwo")
 http {
     authorizeRequests {
         authorize(anyRequest, authenticated)