gkehub: remove google_gke_hub_membership deprecated description field from example

[philipsabri]

Removes the deprecated description field from google_gke_hub_membership in an example to avoid confusion. The field is not used in any other examples.

Release Note Template for Downstream PRs (will be copied)

gkehub: remove `google_gke_hub_membership` deprecated `description` field from example

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[c2thorn]

Hi @philipsabri,
The repository had a language migration today. You can find the correct file you need to change here: https://github.com/GoogleCloudPlatform/magic-modules/blob/main/mmv1/templates/terraform/examples/gkehub_feature_multi_cluster_ingress.tf.tmpl

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 1 deletion(-))
google-beta provider: Diff ( 1 file changed, 1 deletion(-))

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