fix most typos, add crate-ci/typos to CI (#2653)

* fix most typos, add crate-ci/typos to CI

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Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

examples/counters.rs

@@ -12,7 +12,7 @@ fn app() -> Element {
     // Store the counters in a signal
     let mut counters = use_signal(|| vec![0, 0, 0]);
 
-    // Whenver the counters change, sum them up
+    // Whenever the counters change, sum them up
     let sum = use_memo(move || counters.read().iter().copied().sum::<i32>());
 
     rsx! {