copy & paste parameter doc rather than inheriting

[sbfnk]

The documentation of w in energy_score_multivariate() mentions a dat argument which doesn't exist - suggest to copy & paste this over from scoringRules rather than inheriting.

https://github.com/epiforecasts/scoringutils/blob/e6e6bda126b3c2c96d7535e263589e6a14af9606/R/metrics-multivariate-sample.R#L37C1-L37C43

Related to discussion in #1127

[seabbs]

That should be fixed in the latest docs PR I think/hope

[sbfnk]

Always one step ahead.