Dunno about a deliberate page for it, but you can always just search the source for defmacro and check out the docstrings.

Yea that's what I thought too, but I cannot find e.g. the ":f>" macro.

It's not a macro, it's a keyword. You gotta use full text search in Reagent's source code to find it. It's documented here: https://github.com/reagent-project/reagent/blob/master/doc/ReactFeatures.md#function-components