Update documentation from 0.2 changes

[ScatteredInk]

• PEPs
• Date fields across the schema: what goes where - see Docs: add a page on date fields across the schema #387
• Publishers, Entities, source.assertedBy.agent: how they overlap and interact
• How to represent missing/unknown/anonymised information
• Metadata
• Publication patterns for indirect ownership Indirect ownership: improvements to guidance and schema #156

[kathryn-ods]

• We still don't have information about PEPs. My expectation is that this will eventually be stripped out from the main schema and turned into an extension so don't think we need to do this.
• Date fields guidance is done
• I think information about publishers/sources is covered in https://standard.openownership.org/en/main/standard/modelling/record-ids.html
• missing/unknown/anonymised. We have an anonymous example in https://standard.openownership.org/en/main/examples/index.html#a-trust-like-arrangement and an unknown example in https://standard.openownership.org/en/main/standard/modelling/repr-nominations.html and we have info about redaction/corrections

I think this ticket can be closed now as it's quite out of date

[kd-ods]

For the record - improving how to represent missing/unknown/anonymised info is still to be addressed. See this feature ticket and related issues.