Fix PUT collections

[avbentem]

Related Issue(s):

• #665

Description:

• Change the registration of the PUT /collections/{collection_id} endpoint, to include the missing URL fragment when calling the update_collection function
• Add missing tests, and change function signatures in dummy clients to match BaseTransactionsClient
• Minor documentation fixes

PR Checklist:

• [x] pre-commit hooks pass locally
• [x] Tests pass (run make test)
• [x] Documentation has been updated to reflect changes, if applicable, and docs build successfully (run make docs)
• [x] Changes are added to the CHANGELOG.