Harvesting: Clarify recordIdPath change in GN > 4.2.2

[tkohr]

PR clarifies documentation of recordIdPath property for harvesting via a simple URL harvester.

[fxprunayre]

Don't forget to also highlight 4.2.4 new "features" of the ODS harvester https://github.com/geonetwork/core-geonetwork/pull/7059

• produce invalid ISO records
• mix ISO topic categories with free text ODS themes whatever the languages and without icons

[fgravin]

Don't forget to also highlight 4.2.4 new "features" of the ODS harvester geonetwork/core-geonetwork#7059

https://github.com/geonetwork/core-geonetwork/blob/main/CODE_OF_CONDUCT.md#our-standards

Trolling, insulting/derogatory comments, and personal or political attacks

[jodygarnett]

This PR was still open? It missed out on the mkdocs conversion ... can you make this change to core-geonetwork please