Clarify handling of documentation and deleted files in the prompt

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Proposal

The prompt currently says:

Do not comment on documentations

But it doesn't explain what counts as documentation. We should clarify that this may include files like .md, possibly .html, and files located in paths like /docs/.

It also doesn't specify how Duo Code Review should handle deleted files. A deleted file in a MR can mean different things:

• A file was permanently removed
• A file was renamed or moved (git may show this as a deletion + addition)

We can clarify how Duo Code Review should respond in each case.

Why

• Avoids confusion when Duo Code Review encounters non-code or deleted files
• Ensures consistent handling of file removals or moves
• Helps guide proper review coverage and potentially prevents false positives