soundness/docs: Add newline before package manifest snippet #79
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Motivation
The documentation check appends a snippet to the package manifest. When the pacakge manifest doesn't end with a proper newline and happens to end with a comment (as many might with the standard cross-repo comment-fenced package manifest block), it can fail.
Here's an example failed run: https://github.com/swift-server/swift-openapi-async-http-client/actions/runs/12427995650/job/34698796376?pr=44#step:5:219.
Modifications
Simply insert a newline before the snippet.
Result
No functional change, but more defensive against some package manifests.