Suggestion: add details to the the Wiki on options for prior distributions and examples of use cases

[rt17603]

For the prior distributions available or previously used within the inversions, it would be good to include a description of these in the wiki alongside advice for which gases they have been used for in the past and the reasoning behind this.

This would allow moving away from defaults but would also help people to understand why certain distributions may be appropriate for the types of gases they're working on.