Fix code snippets to configure timeouts

Issue: gh-8487

Author: Jean-Pierre Bergamin

docs/manual/src/docs/asciidoc/_includes/servlet/oauth2/oauth2-resourceserver.adoc

@@ -1023,8 +1023,8 @@ To adjust the way in which Resource Server connects to the authorization server,
 @Bean
 public JwtDecoder jwtDecoder(RestTemplateBuilder builder) {
     RestOperations rest = builder
-            .setConnectionTimeout(60000)
-            .setReadTimeout(60000)
+            .setConnectTimeout(Duration.ofSeconds(60))
+            .setReadTimeout(Duration.ofSeconds(60))
             .build();
 
     NimbusJwtDecoder jwtDecoder = NimbusJwtDecoder.withJwkSetUri(jwkSetUri).restOperations(rest).build();
@@ -1576,8 +1576,8 @@ To adjust the way in which Resource Server connects to the authorization server,
 public OpaqueTokenIntrospector introspector(RestTemplateBuilder builder, OAuth2ResourceServerProperties properties) {
     RestOperations rest = builder
             .basicAuthentication(properties.getOpaquetoken().getClientId(), properties.getOpaquetoken().getClientSecret())
-            .setConnectionTimeout(60000)
-            .setReadTimeout(60000)
+            .setConnectionTimeout(Duration.ofSeconds(60))
+            .setReadTimeout(Duration.ofSeconds(60))
             .build();
 
     return new NimbusOpaqueTokenIntrospector(introspectionUri, rest);