Refactor docs

mkdocs-website/docs/en/development/changes_misc.md

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+### Misc
+
+## Windows Application Options
+
+### WndProcInterceptor
+
+If this is set, the WndProc will be intercepted and the function will be called.
+This allows you to handle Windows messages directly. The function should have
+the following signature:
+
+```go
+func(hwnd uintptr, msg uint32, wParam, lParam uintptr) (returnValue uintptr, shouldReturn)
+```
+
+The `shouldReturn` value should be set to `true` if the returnValue should be
+returned by the main wndProc method. If it is set to `false`, the return value
+will be ignored and the message will continue to be processed by the main
+wndProc method.
+
+## Hide Window on Close + OnBeforeClose
+
+In v2, there was the `HideWindowOnClose` flag to hide the window when it closed.
+There was a logical overlap between this flag and the `OnBeforeClose` callback.
+In v3, the `HideWindowOnClose` flag has been removed and the `OnBeforeClose`
+callback has been renamed to `ShouldClose`. The `ShouldClose` callback is called
+when the user attempts to close a window. If the callback returns `true`, the
+window will close. If it returns `false`, the window will not close. This can be
+used to hide the window instead of closing it.
+
+## Window Drag
+
+In v2, the `--wails-drag` attribute was used to indicate that an element could
+be used to drag the window. In v3, this has been replaced with
+`--webkit-app-region` to be more in line with the way other frameworks handle
+this. The `--webkit-app-region` attribute can be set to any of the following
+values:
+
+- `drag` - The element can be used to drag the window
+- `no-drag` - The element cannot be used to drag the window
+
+We would have ideally liked to use `app-region`, however this is not supported
+by the `getComputedStyle` call on webkit on macOS.