path: add more examples for path.Clean

[snyff]

Clarify that the function path.Clean only normalises paths and does not
protect against directory-traversal attacks.

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Patch Set 1:

(1 comment)

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Message from Rob Pike:

Patch Set 2:

(2 comments)

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Message from Sean Liao:

Patch Set 3: Commit-Queue+1

(2 comments)

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Patch Set 3:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-07-06T03:00:19Z","revision":"62bdb2ac0c8dfe070baede2cf65438e4a92f126b"}

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Message from Sean Liao:

Patch Set 3: -Commit-Queue

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Patch Set 3:

This CL has passed the run

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Patch Set 3: LUCI-TryBot-Result+1

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Message from Rob Pike:

Patch Set 4: Code-Review+1

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