Clarify use of update task on 4.2 and earlier [ci skip] #26176
A small clarification in the upgrade guides:
The update task has to be invoked with "rake rails:update" for 4.2 and earlier, but the current guide gives the impression "rails rails:update" would work (instead of "rails app:update" for 5.0, like shown in the example).
At least that's what I kept trying for some time (with admittedly only a very basic knowledge of Rails).
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