Fix doubled words in three docstrings

[marekl11]

Three docstrings with a repeated word: "are the the expected ones" in
test_chef_pipeline.py and "children data for for the node" in
views/internal.py. The third, in test_gcs_storage.py, read "Check that set
set a cache-control of private" - that one was missing a word rather than
repeating one, so it now reads "Check that we set a cache-control".

AI usage

• Disclose: I used Claude Code to search for repeated words in
  docstrings and comments, and to apply the resulting one-word edits.
• Engage critically: I read each hit in context rather than taking
  the search at face value, and confirmed none of the three strings is
  asserted on by a test or used as a translation key.
• Edit: the third hit needed rewriting rather than de-duplicating -
  "Check that set set a cache-control of private" is a missing word, not
  a repeated one, so it now reads "Check that we set a cache-control".
• Process sharing: the lesson worth passing on is that a
  doubled-word search returns three different kinds of hit - real
  duplicates, missing words, and deliberate repetition - so the
  candidates have to be read individually. Here one of three was not a
  plain duplicate.

Docstrings only; no code paths, tests or user-facing text change.

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