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Devel docs: make it clear that decode_ui() gets a new game_ui

At least one puzzle does no actual decoding in decode_ui, but does
re-initialise some fields.  This is unnecessary because the mid-end only
calls decode_ui() with a game_ui it just allocated using new_ui().

--- a/devel.but

+++ b/devel.but

@@ -890,8 +890,8 @@

 \c void (*decode_ui)(game_ui *ui, const char *encoding);

 This function parses a string previously output by \cw{encode_ui()},

-and writes the decoded data back into the provided \c{game_ui}

-structure.

+and writes the decoded data back into the freshly-created \c{game_ui}

+structure provided.

 \S{backend-changed-state} \cw{changed_state()}