modify nutshell section

index.md

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 <h3>Ease of Use</h3>
-Write your model in a text file, Dynare will take care of the rest!
+Write your model almost as you would on paper and Dynare will take care of the rest!
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 <h3>Models</h3>
-Dynare can handle a wide range of macroeconomic models: DSGE, OLG, perfect foresight, ... [find out more!](about)
+Dynare can handle a wide range of macroeconomic models: DSGE, OLG, perfect foresight, ... [find out more](about).
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 <h3>Tasks</h3>