Update the documentation for v8.1.2 API calls

[yhorndt]

Page with Issue

SuiteCRM 8 documentation

What is wrong, less clear, or missing

There is no indication anywhere (v7/v8 docs, that the urls have changed for certain api calls. (i.e. /legacy/ in the request path)

Proposed fixes and/or additions

I've written out my findings on the forum under this url:
Forum post

[ek234]

I would like to contribute to this project. Kindly assign me this issue.

[R0Wi]

It took me half a day to figure out what was wrong with the API URL until I read the thing with appending "/legacy" to the path. Please add this to the docs so that this is clear for everyone.

Thanks @yhorndt btw.