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/linux/x11/util/window_property.rs

@@ -73,7 +73,7 @@ impl XConnection {
                 new_value
                     .len()
                     .try_into()
-                    .expect("too many items for propery"),
+                    .expect("too many items for property"),
                 bytemuck::cast_slice::<T, u8>(new_value),
             )
             .map_err(Into::into)