[cleanup] fix typos in documentation.

Max Kahntrequested to merge
max.kahnt/dune-functions:patch-3 into master

The default IMS for power is LeafBlockedInterleaved. This addresses the same issues as !61 (closed), but avoids breakage since it only adjusts the documentation. (Read: Please delete !61 (closed) if this is merged and vice-versa.)

I cannot add labels myself, apparently. This MR deserves a "doc" label

Edited by Max Kahnt

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