Missing API docs

[crandmck]

There were a lot of changes in #1266. Some don't have docs:

• Builder.Update constructor for auto parent ingredient generation.
• BuilderFlow Enum to keep track of the Builder constructor mode.
• New actions.ingredients() method returns hashed_uris. I don't see the method at all in the Action struct methods list.

These are all mentioned in the PR, but I don't see any docs for them when I run make doc.

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