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

[Dune]

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The following task is now closed:

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

Reason for closing: Fixed
Additional comments about closing: in dune-grid-howto 356 (trunk) and 357 (2.1)

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