RouteInstructionRef reintroduced (#588)

* fix 466

with including also the stuff that Christophe wrote.

* Lint and update documentation tables

* Update xsd/netex_part_1/part1_networkDescription/netex_routeInstruction_version.xsd

Co-authored-by: Stefan de Konink <stefan@konink.de>

* example, fixed choice, added constraints

* Lint and update documentation tables

* fix carrdinalties and a typo

* sequences in choice

* Lint and update documentation tables

* Apply suggestions from code review

* typos and simplification

* Lint and update documentation tables

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Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Stefan de Konink <stefan@konink.de>

Author: 3 people