[doc] Update documentation in logentries.py
[doc] Update documentation in logentries.py

The API changes was made with mw 1.25, not 1.19
https://www.mediawiki.org/w/index.php?title=API:Logevents&oldid=2661391

Change-Id: Ife1ecf5ff38dfaacf464eaecc40889c294225011

wikimedia/pywikibot-core,wikimedia/pywikibot-core