Map: document explicitly that initial regions are immutable.

Chris Boyle reports that a few users of the Android port were confused
by this, e.g. https://github.com/chrisboyle/sgtpuzzles/issues/624 .

(That seems surprising to me, since I view Map as extremely closely
related to Solo - both are special cases of the general game class
'here is a partial k-colouring of a graph, find the unique total
k-colouring that extends it', just with different ranges of k and
different valid graphs. And surely nobody approaches a Sudoku puzzle
and expects to be able to rub out provided clues they don't like! But
I suppose if you're thinking of Map as a completely separate puzzle
then perhaps that analogy doesn't have the same force.)

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