According to guides like [0] RESTful resource name should
use pluralization for nouns, for the sake of consistency.
As such, this PS renames PUT bucket/{bucket_name}/documents
to PUT buckets/{bucket_name}/documents
Required renames have also been made to the following UCP
projects:
- Shipyard -> https://review.gerrithub.io/#/c/384121/
[0] https://restfulapi.net/resource-naming/
Change-Id: Icb01e29db0b8b12e66895135baa9be525ba7d72b