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/ios/app_state.rs

@@ -551,7 +551,7 @@ pub fn did_finish_launching(mtm: MainThreadMarker) {
         //
         // relevant iOS log:
         // ```
-        // [ApplicationLifecycle] Windows were created before application initialzation
+        // [ApplicationLifecycle] Windows were created before application initialization
         // completed. This may result in incorrect visual appearance.
         // ```
         let screen = window.screen();

src/platform_impl/ios/event_loop.rs

@@ -76,7 +76,7 @@ impl EventLoopWindowTarget {
 
     pub(crate) fn exit(&self) {
         // https://developer.apple.com/library/archive/qa/qa1561/_index.html
-        // it is not possible to quit an iOS app gracefully and programatically
+        // it is not possible to quit an iOS app gracefully and programmatically
         log::warn!("`ControlFlow::Exit` ignored on iOS");
     }
 

src/platform_impl/ios/mod.rs

@@ -85,7 +85,7 @@ pub(crate) use crate::platform_impl::Fullscreen;
 
 /// There is no way to detect which device that performed a certain event in
 /// UIKit (i.e. you can't differentiate between different external keyboards,
-/// or wether it was the main touchscreen, assistive technologies, or some
+/// or whether it was the main touchscreen, assistive technologies, or some
 /// other pointer device that caused a touch event).
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct DeviceId;