Minor fixes on Introduction tutorial#175

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Commits on Jun 30, 2019

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Leandro Del Sole
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The trigger was not generated automatically with this suffix "-trigger". The default trigger name may have changed.
Leandro Del Sole
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The directory starting with "/" seems to be a root directory, but it isn't. I was in doubt if it should be only "`gofn` directory" or "`./gofn` directory". Decided for the latter because of two rea…
Leandro Del Sole
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