[dev] api docs for horde and imp

[Jan Schneider]

Zitat von Duck <duck at obala.net>:

> missing PHP Docs for horde and imp to be fully parsed by Refactor [#6131] .

I tweaked and committed the IMP patch, but please review the Horde docs:
- Don't remove the grouping headers
- Fix alignment and indention of parameter names and descriptions.
- Use third person for the method descriptions.

Jan.

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