[WIP] Update documentation for Serverpod 3 WebServer

[Copilot]

Thanks for the feedback on #342. I've created this new PR, which merges into #342, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #342
Triggering comment (#342 (comment)):

@copilot All the broken formatting of code-snippets should be reverted now. Please check, and close resolved comments.

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