[Dune] [#920] Fix some small typos etc in the dune-grid-howto tutorial

[Dune]

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FS#920 - Fix some small typos etc in the dune-grid-howto tutorial
User who did this - Oliver Sander (sander)

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Thanks for the patches. You submitted them the proper way.  I'll disregard the line break patch, as adding explicit line breaks may lead to strange formatting in the future.
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