Updates docs with ingress Host header changes

[crhino]

Clarify that a Host header is required for L7 protocols, and specify
that the default is to use the Consul DNS ingress subdomain

This comes from merging #7990 and #8083, as well as just better clarity.

[david-yu]

@crhino In running and using an Ingress Gateway section, could we also include that layer7 routing can be used to direct traffic from Ingress Gateway to services? This would be optional but would complete the Ingress Gateway flow in my opinion.

[crhino]

@david-yu Pushed a change to add a sentence like that, let me know how you feel?

[crhino]

Added a note in the config entry page about port numbers from feedback in #8045

[david-yu]

Ok this LGTM, thanks!

[hashicorp-ci]

🍒✅ Cherry pick of commit bb103f2 onto stable-website succeeded!

[nicholasjackson]

@crhino Bit late on this one since it has already been merged but I suggest the example is updated to reflect the documentation enhancement. If folks cut and paste the sample it will cause confusion when it does not work.

Either the below example should have the port changed to 80 or the port 4567 should be added to the hosts as specified in the documentation.

{
    Port     = 4567
    Protocol = "http"
    Services = [
      {
        Name  = "api"
        Hosts = ["foo.example.com"]
      },
      {
        Name  = "web"
        Hosts = ["website.example.com"]
      }
    ]
  }

[david-yu]

Hmm is it just me @crhino or did the docs not get cherry picked here? https://www.consul.io/docs/connect/ingress-gateway

[crhino]

@david-yu These changes are in the config entry documentation: https://www.consul.io/docs/agent/config-entries/ingress-gateway