docs(openapi): Align new endpoints with existing ones

[jvallesm]

Because

• New endpoints use a different convention for specifying the format of a field than the previously documented endpoints.
  • E.g.: organizations/<org_id>/pipelines/<pipeline_id> vs organizations/{organization.id}/pipelines/{pipeline.id}.

This commit

• Unifies the convention.
• Fixes a typo due to copypaste (a organization -> an organization)

🗒️

cc @donch1989 I hope this PR doesn't read as nitpicky 😅 It's hard to enforce these conventions by e.g. linter but I think having consistency in our docs is good for the public image of Instill AI. I'd say the best way to keep consistent at this point is relying on existing documentation and on peer reviews (I doubt product / marketing will QA OpenAPI docs in the short term)

[donch1989]

Great Thanks!