docs: release-note rewriter improvements

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+## Rewriter improvements
+
+The [rewriter](Rewriter.md) added support for writing the `project()`
+`license_files` argument and for reading dict-valued kwargs.
+
+It also removed the unused but mandatory `value` arguments to the
+`default-options delete` and `kwargs delete` CLI subcommands.  To allow
+scripts to continue supporting previous releases, these arguments are
+still accepted (with a warning) if they're all equal to the empty string.