Clarify the comment about canonical node order.
Clarify the comment about canonical node order.

Summary:
The nodes in an EntrySet message may be in canonical vname order, but are not
required to. Make that explicit in the comment.

Reviewers: shahms, #core_team, schroederc

Reviewed By: shahms, #core_team, schroederc

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1910

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