Upstream changes to google_compute_global_network_endpoint docs

[rileykarson]

Upstream hashicorp/terraform-provider-google#6827, also make some minor changes so they resemble the real configs in our tests more closely.

skip_test is applied here due to the CheckDestroy not working correctly for FGRs.

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 7 insertions(+), 12 deletions(-))
Terraform Beta: Diff ( 1 file changed, 7 insertions(+), 12 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=135138"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccEndpointsService_basic You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=135144"