### What?
Consolidates logic in update and updateByID. These two operations used a
lot of the same core functionality. This is a QOL improvement for future
features/fixes on each operation. You will not need to make changes to
both operations now.
### Why?
Recently we released a feature for `publishSpecificLocale` and that was
only implemented on the updateByID operation. I think future
enhancements and fixes may suffer the same treatment.
### How?
Moves shared logic into a new file with a function called
`updateDocument`.
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