Add override for docs sections - apply to compute and monitoring.

[nat-henderson]

Fixes hashicorp/terraform-provider-google#10123.

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).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

Minor docs reorganization to group all Compute Engine and Monitoring (Stackdriver) resources together.

[modular-magician]

Oops! It looks like you're using an unknown release-note type in your changelog entries:

• REPLACEME

Please only use the types listed in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md.

[modular-magician]

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

Diff report:

Terraform Beta: Diff ( 2 files changed, 5 insertions(+), 17 deletions(-))

[rileykarson]

Your code makes sense and I can't see why, but it doesn't seem to have taken- this only applied to Stackdriver at TPGB.

[nat-henderson]

Well, huh. I'll figure that out and ping you when it works.

[rileykarson]

Also, before digging too deep I'd suggest rebasing on my api/ change (it touched how products are loaded a little)

[modular-magician]

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

Diff report:

Terraform Beta: Diff ( 3 files changed, 6 insertions(+), 18 deletions(-))

[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, 15 insertions(+), 27 deletions(-))
Terraform Beta: Diff ( 7 files changed, 22 insertions(+), 47 deletions(-))