Close #18990: remove root attribute from XMLPullParser
- this was an internal implementation detail for iterparse
- this has been changed to use a new private method instead
- XMLPullParser.close docs are now more explicit about not
returning a root element and instead direct users towards
read_events
- also added missing docstrings and clarified some details
related to exactly *when* events are consumed from the
internal queue
projects / python / commit