EDU-1655: Minor updates to functioning "hello world" in Java

[fairlydurable]

• Fixes typos
• Fixes links
• Adds information about snipsync'ed links to mdx front matter

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Name	Status	Preview	Comments	Updated (UTC)
temporal-learning	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2024 3:58pm