docs: fixed missing/incorrect params for many functions

[Jaskowicz1]

This PR fixes many missing/incorrect params for some functions.

This PR also adds the message_edit_flags coro and sync calls, as they were missing from the last PR.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[Jaskowicz1]

It's worth noting that there are still a couple of issues left, however, these are not things that are missing but rather doxygen struggling to understand a couple things. These are:

/mnt/c/Users/archi/Desktop/DPP/include/dpp/event_router.h:714: warning: unable to resolve reference to 'operator(F&&)' for \ref command
/mnt/c/Users/archi/Desktop/DPP/include/dpp/coro/coroutine.h:439: warning: argument 'expr' from the argument list of dpp::detail::coroutine::promise_t::return_value has multiple @param documentation sections
/mnt/c/Users/archi/Desktop/DPP/include/dpp/event_router.h:145: warning: unexpected token in comment block while parsing the argument of command throw
/mnt/c/Users/archi/Desktop/DPP/include/dpp/event_router.h:140: warning: documented empty return type of dpp::detail::event_router::awaitable::await_suspend
/mnt/c/Users/archi/Desktop/DPP/include/dpp/coro/task.h:626: warning: unable to resolve reference to 'proxy_awaiter' for \ref command
/mnt/c/Users/archi/Desktop/DPP/include/dpp/coro/task.h:662: warning: argument 'expr' from the argument list of dpp::detail::task::promise_t::return_value has multiple @param documentation sections
/mnt/c/Users/archi/Desktop/DPP/include/dpp/coro/task.h:626: warning: unable to resolve reference to 'proxy_awaiter' for \ref command