More customResolver docs changes from v4

Author: Liam-Doodson

docs/modules/ROOT/pages/custom-resolvers.adoc

@@ -70,7 +70,7 @@ type User implements UserInterface {
 }
 ----
 
-The following resolvers definition would be invalid:
+The following resolvers definition would cause a warning to be logged:
 
 [source, javascript, indent=0]
 ----
@@ -83,7 +83,8 @@ const resolvers = {
 };
 ----
 
-Instead, the following resolvers definition would be required:
+The following resolvers definition would silence the warning:
+
 [source, javascript, indent=0]
 ----
 const resolvers = {
@@ -95,19 +96,7 @@ const resolvers = {
 };
 ----
 
-These checks may not always be required or desirable. If this is the case, they can be disabled using the `startupValidation` config option:
-
-[source, javascript, indent=0]
-----
-const neoSchema = new Neo4jGraphQL({
-    typeDefs,
-    config: {
-        startupValidation: {
-          resolvers: false
-        },
-    },
-})
-----
+Mismatches between the resolver map and `@customResolver` directives will always be logged to the console as a warning.
 
 [[custom-resolvers-computed]]
 === `@computed`