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/project_panel/src/file_associations.rs

@@ -44,7 +44,7 @@ impl FileAssociations {
     pub fn get_icon(path: &Path, cx: &AppContext) -> Option<Arc<str>> {
         let this = cx.has_global::<Self>().then(|| cx.global::<Self>())?;
 
-        // FIXME: Associate a type with the languages and have the file's langauge
+        // FIXME: Associate a type with the languages and have the file's language
         //        override these associations
         maybe!({
             let suffix = path.icon_suffix()?;