Add typo detection to CI (#4107)

Adding the typos crate to our CI will take some doing, as we have
several tests which rely on typos in various ways (e.g. checking state
as the user types), but I thought I'd take a first stab at fixing what
it finds.

Release Notes:

- N/A

crates/vim/src/normal/repeat.rs

@@ -152,7 +152,7 @@ pub(crate) fn repeat(cx: &mut WindowContext, from_insert_mode: bool) {
 
         let mut count = Vim::read(cx).workspace_state.recorded_count.unwrap_or(1);
 
-        // if we came from insert mode we're just doing repititions 2 onwards.
+        // if we came from insert mode we're just doing repetitions 2 onwards.
         if from_insert_mode {
             count -= 1;
             new_actions[0] = actions[0].clone();