Update doc to add logging bucket as sink destination

[venkykuberan]

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• [X ] Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

  docs updated to add logging bucket as sink destination

fixes hashicorp/terraform-provider-google#7590

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 4 files changed, 11 insertions(+), 7 deletions(-))
Terraform Beta: Diff ( 4 files changed, 11 insertions(+), 7 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=155252"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataSourceIAMBetaWorkloadIdentityPool_basic|TestAccDataSourceSpannerInstance_basic|TestAccBigqueryDataTransferConfig|TestAccResourceGoogleProjectDefaultServiceAccountsBasic|TestAccResourceGoogleProjectDefaultServiceAccountsDisable|TestAccResourceGoogleProjectDefaultServiceAccountsDelete|TestAccResourceGoogleProjectDefaultServiceAccountsDeprivilege|TestAccOSLoginSSHPublicKey_osLoginSshKeyBasicExample You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=155335"

[c2thorn]

Just saw that you removed the review request. The changes LGTM, but if you want me to review again later, let me know!