Fix grammar: "an flow" → "a flow"#672

Knerio with Copilot wants to merge 3 commits into

646-adjust-mutation-error-responsescode0-tech/sagittarius:646-adjust-mutation-error-responsesfrom

copilot/sub-pr-670-againcode0-tech/sagittarius:copilot/sub-pr-670-againCopy head branch name to clipboard