[docs] [issue20874] Tutorial section on starting python is out of date

[R. David Murray]

R. David Murray added the comment:

Just as a point of information, when making a patch like this it is best to change the smallest number of lines possible, without worrying about line wrapping.  This allows us to see just what was changed.  The committer can then reflow the paragraph (actually I prefer to commit the minimum change and then do a separate reflow commit).

The patch itself looks fine.  Stéphane: the original docs didn't explain it either, and in 3.4 you don't have to do anything to enable it.  (That is, if it isn't automatically enabled, it *can't* be turned on, because readline isn't available.)

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