docs(elasticloadbalancingv2): update confusing AddNetworkTargets port…

… description (#30208)

### Reason for this change

The existing `port` description can be confusing as `listener` could easily be mistaken as a reference to a Load Balancers `listener` and imply that the value should match.

Additionally, "traffic" seems more semtantically correct for an NLB than "requests".

### Description of changes

Updated the `port` description on `AddNetworkTargetsProps`  to match the one used in the `ApplicationTargetGroup` as that uses less ambigous language.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/aws-cdk-lib/aws-elasticloadbalancingv2/lib/nlb/network-listener.ts

@@ -335,7 +335,7 @@ export interface AddNetworkActionProps {
  */
 export interface AddNetworkTargetsProps {
   /**
-   * The port on which the listener listens for requests.
+   * The port on which the target receives traffic.
    *
    * @default Determined from protocol if known
    */