fixed firewall endpoint association example

[maxi-cit]

Fixes: hashicorp/terraform-provider-google#18776

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[modular-magician]

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Diff report

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

google provider: Diff ( 1 file changed, 21 insertions(+), 6 deletions(-))
google-beta provider: Diff ( 1 file changed, 21 insertions(+), 6 deletions(-))

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