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

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

---------

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

examples/multiwindow.rs

@@ -1,6 +1,6 @@
 //! Multiwindow example
 //!
-//! This exmaple shows how to implement a simple multiwindow application using dioxus.
+//! This example shows how to implement a simple multiwindow application using dioxus.
 //! This works by spawning a new window when the user clicks a button. We have to build a new virtualdom which has its
 //! own context, root elements, etc.