rephrased index page a bit

Author: rsill-neo4j

modules/ROOT/pages/security/index.adoc

@@ -5,10 +5,12 @@ auth/authorization.adoc, auth/auth-directive.adoc, auth/subscriptions.adoc, \
 auth/authorization/allow.adoc, auth/authorization/bind.adoc, auth/authorization/roles.adoc, \
 auth/authorization/where.adoc, authentication-and-authorization/index.adoc
 
+The Neo4j GraphQL Library offers the following security features:
 
-* xref::/security/configuration.adoc[Configuration] - Instructions to set up instantiation.
-* xref::/security/authentication.adoc[Authentication] - Explicit authentication, configured using the `@authentication` directive.
-* xref::/security/authorization.adoc[Authorization] - Authorization rules set using the `@authorization` directive. 
-* xref::/security/subscriptions-authorization.adoc[Subscriptions authorization] - Authorization rules for subscriptions set using the `@subscriptionsAuthorization` directive.
-* xref::/security/impersonation-and-user-switching.adoc[Impersonation and user switching] - How to set up impersonation and user switching features.
-* xref::/security/operations.adoc[Operations] - Reference on GraphQL queries and how each location in each query triggers the evaluation of different authentication/authorization rules.
+* xref::/security/configuration.adoc[Configuration] of JSON Web Token (JWT) authentication with encoded or decoded JWTs.
+* xref::/security/authentication.adoc[Authentication] for different operations on different parts of your schema with the `@authentication` directive.
+* Rule-based xref::/security/authorization.adoc[authorization] filtering and validation with the `@authorization` directive. 
+* Rule-based xref::/security/subscriptions-authorization.adoc[subscriptions authorization] for subscriptions with the `@subscriptionsAuthorization` directive.
+* xref::/security/impersonation-and-user-switching.adoc[User impersonation and switching].
+
+See xref::/security/operations.adoc[Operations] for GraphQL query examples on how to trigger the evaluation of different authentication and authorization rules.