DOC-5003 - PCU-only note for database creation

[aimurphy]

• PCU-only enforcement requires new databases in enterprises to belong to a PCU group. The Astra CLI doesn't support PCU group selection when creating a DB, so users cannot use the Astra CLI to create DBs if their organization is PCU-only. https://d5rxiv0do0q3v.cloudfront.net/doc-5003/astra-cli/managing.html#create-a-database
• Same thing applies for multi-region https://d5rxiv0do0q3v.cloudfront.net/doc-5003/astra-cli/managing.html#configure-multiple-regions
• Update some attribute usage, which is also in DOC-5236  #26.

[drchung5]

LGTM

[plpesvc-ds]

Build successful! ✅
Pull requests with matching branch name doc-5003 included in the build:

• DOC-5003 - PCU-only note for database creation #25 (this pull request)
• https://github.com/riptano/docs-common/pull/78
• https://github.com/riptano/astra-vector-docs/pull/1130

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