Fix various typos

Mainly fix typos in comments, but also some minor code changes:

* Rename `apply_on_poiner` to `apply_on_pointer`.
* Rename `ImeState::Commited` to `ImeState::Committed`
* Correct `cfg_attr` usage: `wayland_platfrom` -> `wayland_platform`.

src/platform_impl/orbital/window.rs

@@ -489,7 +489,7 @@ impl Window {
     pub fn raw_window_handle_rwh_06(&self) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
         let handle = rwh_06::OrbitalWindowHandle::new({
             let window = self.window_socket.fd as *mut _;
-            std::ptr::NonNull::new(window).expect("orbital fd shoul never be null")
+            std::ptr::NonNull::new(window).expect("orbital fd should never be null")
         });
         Ok(rwh_06::RawWindowHandle::Orbital(handle))
     }