Improve @step and self.next() explanation in HelloFlow tutorial

[Akash-1725]

PR Type

• Bug fix
• New feature
• Core Runtime change (higher bar -- see CONTRIBUTING.md)
• [ x] Docs / tooling
• Refactoring

Summary

Improved the explanation of @step and self.next() in the HelloFlow tutorial to make step transitions clearer for beginners.

Issue

N/A

Fixes

N/A

Reproduction

N/A (This is a documentation improvement, not a bug fix)

Runtime: N/A

Commands to run:
`# N/A

Where evidence shows up: N/A

Details

Before: Explanation of @step and self.next() was minimal and unclear for beginners.

After:
Added comments and explanation clarifying how step transitions work in the HelloFlow tutorial.

Root Cause

The tutorial lacked a clear explanation of how @step transitions and self.next() determine execution order, which may confuse new users.

Why This Fix Is Correct

The added comments and explanation improve clarity and help beginners understand workflow transitions without changing any functionality.

Failure Modes Considered

N/A (No functional changes were made)

Tests

• Unit tests added/updated
• Reproduction script provided (required for Core Runtime)
• CI passes
• If tests are impractical: explain why below and provide manual evidence above

This is a documentation-only change, so no tests were required.

Non-Goals

No functional or runtime behavior was changed. This PR only improves documentation clarity.

AI Tool Usage

• No AI tools were used in this contribution
• AI tools were used (describe below)

Used AI tools (GitHub Copilot) to help refine and structure the explanation. All changes were reviewed and understood before submission.

[greptile-apps]

Greptile Summary

This is a documentation-only PR that adds helpful inline comments to metaflow/tutorials/00-helloworld/helloworld.py to clarify how @step decorators and self.next() calls work in the HelloFlow tutorial. The comments are accurate, well-placed, and improve the on-boarding experience for beginners.

• Added two class-level comments explaining that each @step defines a workflow stage and that self.next() drives execution order.
• Added inline comments before the self.next() calls in start and hello to reinforce which step runs next.
• No functional or runtime changes were made.
• The only unintended side effect is the removal of the trailing newline at the end of the file, which should be restored.

Confidence Score: 5/5

Safe to merge — purely a documentation improvement with no functional changes.

All findings are P2 (style). The only issue is a missing trailing newline that was accidentally dropped; no logic or behavior is affected.

No files require special attention beyond restoring the trailing newline in helloworld.py.

Important Files Changed

Filename	Overview
metaflow/tutorials/00-helloworld/helloworld.py	Adds inline comments explaining @step and self.next() to aid beginners; inadvertently removes the trailing newline at EOF.

_{Reviews (1): Last reviewed commit: "Improve explanation of @step and self.ne..." | Re-trigger Greptile}

[greptile-apps]

Missing trailing newline at end of file

The original file had a trailing newline after HelloFlow(), but this PR removed it (shown by \ No newline at end of file in the diff). Most style guides and linters expect a newline at the end of source files. This is the only unintended change introduced by the PR.

Suggested change

	HelloFlow()
	HelloFlow()

(ensure there is a newline character after this line)

_{Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!}