Small dirconfig cleanupsdirconfig-polish

- projectile-get-project-directories: replace the (or keep '("")) trick
  with an explicit (if keep ... (list project-dir)). The behavior is
  unchanged but the empty-keep case no longer reads as a string-concat
  with the empty string.

- projectile-dirconfig-file: expand the docstring to spell out the
  dual marker/config role — empty file is enough to mark a project,
  non-empty content drives parsing.

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