Add wording on folder & project for how tags works

[slevenick]

Fixes: hashicorp/terraform-provider-google#19687

These are the only 2 current creation-only tags

Release Note Template for Downstream PRs (will be copied)

[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 ( 4 files changed, 4 insertions(+), 4 deletions(-))
google-beta provider: Diff ( 4 files changed, 4 insertions(+), 4 deletions(-))

Missing test report

Your PR includes resource fields which are not covered by any test.

Resource: google_folder (147 total tests)
Please add an acceptance test which includes these fields. The test should include the following:

resource "google_folder" "primary" {
  tags = # value needed
}

Resource: google_project (930 total tests)
Please add an acceptance test which includes these fields. The test should include the following:

resource "google_project" "primary" {
  tags = # value needed
}

[modular-magician]

Tests analytics

Total tests: 147
Passed tests: 117
Skipped tests: 30
Affected tests: 0

Click here to see the affected service packages

• resourcemanager

🟢 All tests passed!

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