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/collab/src/tests/editor_tests.rs

@@ -1192,7 +1192,7 @@ async fn test_on_input_format_from_host_to_guest(
     executor.run_until_parked();
 
     // Receive an OnTypeFormatting request as the host's language server.
-    // Return some formattings from the host's language server.
+    // Return some formatting from the host's language server.
     fake_language_server.handle_request::<lsp::request::OnTypeFormatting, _, _>(
         |params, _| async move {
             assert_eq!(
@@ -1211,7 +1211,7 @@ async fn test_on_input_format_from_host_to_guest(
         },
     );
 
-    // Open the buffer on the guest and see that the formattings worked
+    // Open the buffer on the guest and see that the formatting worked
     let buffer_b = project_b
         .update(cx_b, |p, cx| p.open_buffer((worktree_id, "main.rs"), cx))
         .await
@@ -1327,7 +1327,7 @@ async fn test_on_input_format_from_guest_to_host(
     });
 
     // Receive an OnTypeFormatting request as the host's language server.
-    // Return some formattings from the host's language server.
+    // Return some formatting from the host's language server.
     executor.start_waiting();
     fake_language_server
         .handle_request::<lsp::request::OnTypeFormatting, _, _>(|params, _| async move {
@@ -1350,7 +1350,7 @@ async fn test_on_input_format_from_guest_to_host(
         .unwrap();
     executor.finish_waiting();
 
-    // Open the buffer on the host and see that the formattings worked
+    // Open the buffer on the host and see that the formatting worked
     let buffer_a = project_a
         .update(cx_a, |p, cx| p.open_buffer((worktree_id, "main.rs"), cx))
         .await
@@ -1824,7 +1824,7 @@ async fn test_inlay_hint_refresh_is_forwarded(
         assert_eq!(
             inlay_cache.version(),
             1,
-            "Should update cache verison after first hints"
+            "Should update cache version after first hints"
         );
     });