Copy editing on Order api

Update custom data for apiv4 mentioning the class used for OOP coding…

API - Add redirects for relocated APIv3 pages

These pages were moved (e.g.  03b42ee6).
Add corresponding redirects.

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

I just read the first part & believe this edit makes it more succinct & clearer

Update Order docs to reflect https://github.com/civicrm/civicrm-core/…

Update custom data for apiv4 mentioning the class used for OOP coding format for Multi Record Custom data sets

Add in documentation on APIv4 and Custom Data

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Fix spelling on 'omit'

Add space in 'alot'

Co-Authored-By: colemanw <coleman@civicrm.org>

Add "in progress" note to Financial section pages.

add financial/overview (WIP waiting on Rich)

Update chaining.md

Add in chaining and join docs for APIv4 and update v3 example URLS an…

Add in APIv4 Actions documentation

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Update wiki to docs redirects

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>