API: update deprecation for action=query list=flow

The new API is available, so change message in getDescription()

Also use a more plausible flowpage in getExamples().
Only string changes.

Change-Id: I6544b735bffce04f9bb31e6092e7118440b03c9a
Merge "API: update deprecation for action=query list=flow" into frontend-rewrite