Apply review suggestions: fix spelling, grammar, and code examples

[Copilot]

Applied all review feedback from copilot-pull-request-reviewer on PR #2946.

Corrections made:

• Fixed spelling: usecases → use cases, obect → object
• Fixed grammar: subscribe to a messages → subscribe to messages (4 occurrences)
• Fixed localhost URLs to relative paths: http://localhost:8000/docs/... → /docs/... (2 occurrences)
• Fixed incorrect method calls in delete examples: updateMessage() → deleteMessage() (2 occurrences in javascript and nodejs code blocks)

All changes are in /src/pages/docs/messages/updates-deletes.mdx.

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