PRD03- Pt 2, 4.11.12 "must" -> "shall" x 3

[Alex Brown <alexb@griffinbrown.co.uk>]

Current text reads:

[...] it must be one of these two processing orders. If processing row-at-a-time, the sequence must be produced by processing each row in turn, from smallest to largest column value (e.g., A1, B1, C1). If processing column-at-a-time, the sequence must be produced by processing each column [...]

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