Fix wrong API comment
Summary:
The load method only requires item to be valid, and then fetches it
unconditionally to make sure all required data like tags are present.
Test Plan: Just a change in comments; no testing done
Reviewers: KDE PIM, dvratil
Reviewed By: KDE PIM, dvratil
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D7551