Doc: when adding Qt versions, qmake folder is selected first
Doc: when adding Qt versions, qmake folder is selected first

Changed the text to describe the process more accurately.

Change-Id: I7ea9eba2b1b70ea764895beb4401a287644e8f45
Reviewed-by: Tobias Hunger <012f8d714267bccc9d4766fbeace9f175fcc70c4@digia.com>

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