docs: Fix global CORS configuration property path

The globalcors configuration properties were documented under the
old path spring.cloud.gateway.globalcors, but were moved to
spring.cloud.gateway.server.webflux.globalcors in a prior refactor.

Updated both the YAML example and the inline property reference
in the prose to use the correct path.

Fixes gh-4103

Signed-off-by: Tarte <emprimula@gmail.com>

Author: Tarte12

docs/modules/ROOT/pages/spring-cloud-gateway-server-webflux/cors-configuration.adoc

@@ -17,17 +17,19 @@ The following example configures CORS:
 spring:
   cloud:
     gateway:
-      globalcors:
-        cors-configurations:
-          '[/**]':
-            allowedOrigins: "https://docs.spring.io"
-            allowedMethods:
-            - GET
+      server:
+        webflux:
+          globalcors:
+            cors-configurations:
+              '[/**]':
+                allowedOrigins: "https://docs.spring.io"
+                allowedMethods:
+                - GET
 ----
 
 In the preceding example, CORS requests are allowed from requests that originate from `docs.spring.io` for all GET requested paths.
 
-To provide the same CORS configuration to requests that are not handled by some gateway route predicate, set the `spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping` property  to `true`.
+To provide the same CORS configuration to requests that are not handled by some gateway route predicate, set the `spring.cloud.gateway.server.webflux.globalcors.add-to-simple-url-handler-mapping` property to `true`.
 This is useful when you try to support CORS preflight requests and your route predicate does not evaluate to `true` because the HTTP method is `options`.
 
 [[route-cors-configuration]]