Update `metal_connection` resource examples to use Fabric resources

[ctreatma]

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Description

All of the examples in the documentation for the metal_connection resource use the ecx resources for Fabric interactions. In order to encourage users to adopt the new fabric resources, our examples should use fabric resources wherever possible.

New or Affected Resource(s)

N/A

Potential Terraform Configuration

# Propose what you think the configuration to take advantage of this feature should look like.
# We may not use it verbatim, but it's helpful in understanding your intent.

References

• https://registry.terraform.io/providers/equinix/equinix/latest/docs/resources/equinix_metal_connection#example-usage

[displague]

There should also be an example that does not include equinix_fabric_connection -- a Metal only Conenction + VC path. (for example, the TF equivalent of https://deploy.equinix.com/developers/docs/metal/interconnections/connecting-to-aws/)