Yes Akira Toriyama did do some editing of it, but he did not write the series. He may be seen as the Author in credits, that is because he created the Dragon Ball manga. Dragon Ball and Dragon Ball Z are the main two series. Dragon Ball GT can either be considered canon or non canon, it is up to you. This is what is says to GT being canon
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But in reality it's not canon. He said it's just a side story, fans that didn't want Dragon Ball Z to end can see it as a continuation of Dragon Ball Z.