improve upgrade docs and fix Config link

UPGRADING_V4_TO_V5.md

@@ -2,12 +2,26 @@
 
 This guide documents changes between v4 and v5 for upgrading existing code.
 
-Notify v5 only contains precise events. Debouncing is done by a separate crate [notify-debouncer-mini](https://github.com/notify-rs/notify/tree/main/notify-debouncer-mini).
+Notify v5 only contains precise events. Debouncing is done by a separate crate [notify-debouncer-mini](https://github.com/notify-rs/notify/tree/main/notify-debouncer-mini). If you relied on `RawEvent`, this got replaced by `Event`.
 
-If you've used the default debounced API, please see [here](https://github.com/notify-rs/notify/blob/main/examples/debounced.rs) for an example.
+The old `DebouncedEvent` is completely removed. notify-debouncer-mini only reports an `Any` like event (named `DebouncedEvent` too) as relying on specific kinds (Write/Create/Remove) is very plattform specific and [can't](https://github.com/notify-rs/notify/issues/261) [be](https://github.com/notify-rs/notify/issues/187) [guaranteed](https://github.com/notify-rs/notify/issues/272) to work, relying on a lot of assumptions. In most cases you should check anway what exactly the state of files is, or probably re-run your application code, not relying on which event happened.
+
+If you've used the previously by default debounced API, please see [here](https://github.com/notify-rs/notify/blob/main/examples/debounced.rs) for an example using the new crate.
 
 For precise events you can see [here](https://github.com/notify-rs/notify/blob/main/examples/monitor_raw.rs).
 
-Notify v5 by default uses crossbeam-channel internally. You can disable this (required for tokio) as documented in the crate.
+Watchers now accept the `EventHandler` trait for event handling, allowing for callbacks and foreign channels.
+
+## Config
+
+All watcher only expose the `Watcher` trait, which takes an `EventHandler` and a `Config`, the latter being used to possibly initialize things that can only be specified before running the watcher. One Example would be the `compare_contents` from `PollWatcher`.
+
+## Features
+
+Notify v5 by default uses crossbeam-channel internally. You can disable this (required for tokio) as documented in the crate, this may be required for tokio users.
+
+For macOS the kqueue backend can now be used alternatively by using the `macos_kqueue` feature.
+
+## Plattforms
 
 Plattform support in v5 now includes BSD and kqueue on macos in addition to fsevent.

notify/src/poll.rs

@@ -397,7 +397,7 @@ mod data {
 /// By default scans through all files and checks for changed entries based on their change date.
 /// Can also be changed to perform file content change checks.
 /// 
-/// See [PollWatcherConfig] for more details.
+/// See [Config] for more details.
 #[derive(Debug)]
 pub struct PollWatcher {
     watches: Arc<Mutex<HashMap<PathBuf, WatchData>>>,