Check for typos on CI (#2918)

* Check for typos on CI

* Fix all typos

Cargo.toml

@@ -20,7 +20,7 @@ members = [
 # opt-level = 's' # 10-20% smaller wasm compared to `opt-level = 3`
 # opt-level = 1 # very slow and big wasm. Don't do this.
 opt-level = 2 # fast and small wasm, basically same as `opt-level = 's'`
-# opt-level = 3 # unecessarily large wasm for no performance gain
+# opt-level = 3 # unnecessarily large wasm for no performance gain
 
 # debug = true # include debug symbols, useful when profiling wasm