Improve docs for new apis (#1252)
Improve docs for new apis (#1252)

* fixed more links, updated name of the main doc file

* more fixes

* fixed some symbol links and improved docs in a couple of places

* added links to some subs attributes

* more docs improvements

* more small documentation improvements

* even more doc fixes

* more improvements

* more and more docs fixes

* and even more fixes

* smaller fixes

* improved docs for beginRefundRequest and showManageSubscriptions
RevenueCat/purchases-ios,RevenueCat/purchases-ios,RevenueCat/purchases-ios,RevenueCat/purchases-ios,RevenueCat/purchases-ios