Developer Site Docs for "service-to-service-traffic-datacenters" for Mesh Gateways is a Dead End

#### Overview of the Issue

The [Invoke Services From Lambda Functions](https://developer.hashicorp.com/consul/docs/v1.13.x/lambda/invoke-from-lambda) document has a link to [Mesh Gateways between Datacenters](https://developer.hashicorp.com/consul/docs/connect/gateways/mesh-gateway/service-to-service-traffic-datacenters) under "Deploying Mesh Gateways".

The link provided leads to a page that just shows:
```
{}
```

#### Reproduction Steps

* Go to the [Invoke Services From Lambda Functions](https://developer.hashicorp.com/consul/docs/v1.13.x/lambda/invoke-from-lambda) page
* Under the heading "Deploy the mesh gateway" click [Mesh Gateways between Datacenters](https://developer.hashicorp.com/consul/docs/connect/gateways/mesh-gateway/service-to-service-traffic-datacenters) under "Deploying Mesh Gateways"

### Log Fragments

The browser console is showing a 404 for that page.

Start with the "Invoke Services From Lambda Functions" page and its "Mesh Gateways between Datacenters" link. Inspect the documentation source for the linked pages, determine the correct Mesh Gateway content or destination, and update the dead-end reference. Done means the link no longer returns a 404 or displays {}.

Written by the indexing model from the issue text.