The project update endpoint accepted updates both in two array params:
docUpdates and fileUpdates, and in a single array: updates. This commit
removes the docUpdates/fileUpdates params now that web uses the updates
param.
Add an `updates` parameter to the project update endpoint. It can be
used instead of `docUpdates` and `fileUpdates` to provide a single list
of updates in the order they should be processed.
