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/db/queries/buffers.rs

@@ -152,7 +152,7 @@ impl Database {
                     .await?;
 
                 // If the buffer epoch hasn't changed since the client lost
-                // connection, then the client's buffer can be syncronized with
+                // connection, then the client's buffer can be synchronized with
                 // the server's buffer.
                 if buffer.epoch as u64 != client_buffer.epoch {
                     log::info!("can't rejoin buffer, epoch has changed");
@@ -970,7 +970,7 @@ fn version_from_storage(version: &Vec<storage::VectorClockEntry>) -> Vec<proto::
         .collect()
 }
 
-// This is currently a manual copy of the deserialization code in the client's langauge crate
+// This is currently a manual copy of the deserialization code in the client's language crate
 pub fn operation_from_wire(operation: proto::Operation) -> Option<text::Operation> {
     match operation.variant? {
         proto::operation::Variant::Edit(edit) => Some(text::Operation::Edit(EditOperation {