Reorder alphabetically. There are a significant number of events that are not alphabetically ordered in docs/events.md.

Examples:
acp_group_options_before < acp_group_options_after

ucp_register_credentials_before < ucp_register_profile_fields_after < ucp_register_credentials_after < ucp_register_options_before < ucp_register_profile_fields_before

And there are a significant number like these. Please fix, and keep updated.