docs/hello_world_deprecation.md contains a stray HTML comment token ('sdfrghujikol;')

[nanaf6203-bit]

Context: docs/hello_world_deprecation.md includes a stray comment marker (<!-- sdfrghujikol; -->), evidently an editor artifact unrelated to the deprecation content.

Problem: The artifact looks like a leftover paste/autocomplete and appears in docs rendering if the renderer interprets HTML; it undermines the doc's polish and trips strict linting.

Proposed approach: Remove the stray comment token; run the doc-sync script (scripts/verify_doc_sync.sh) to confirm still consistent.

Acceptance criteria: the token is gone and the doc still renders correctly.

[Killerjunior]

@Killerjunior has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi maintainer, I have read and understood the issue requirements and checked the necessary documentation. I’m confident I can work on this task effectively and deliver a proper solution.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Killerjunior to this issue.

[mercy60]

@mercy60 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hello, I'm a fullStack developer with years of experience, I have worked on several projects, can I please work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mercy60 to this issue.

[drips-wave]

Congratulations, @mercy60! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @mercy60: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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