review: quick doc improvements

Author: BillCarsonFr

crates/matrix-sdk-base/src/response_processors/e2ee/to_device.rs

@@ -101,7 +101,7 @@ async fn process(
 
         let events = events
             .iter()
-            // XXX There is loss of information here, after calling `to_raw` it is not
+            // TODO: There is loss of information here, after calling `to_raw` it is not
             // possible to make the difference between a successfully decrypted event and a plain
             // text event. This information needs to be propagated to top layer at some point if
             // clients relies on custom encrypted to device events.

crates/matrix-sdk-crypto/src/machine/mod.rs

@@ -1474,7 +1474,7 @@ impl OlmMachine {
             .garbage_collect()
             .iter()
             // These are `fake` to device events just serving as local echo
-            // in order for own client to react quickly to cancelled transaction.
+            // in order that our own client can react quickly to cancelled transaction.
             // Just use PlainText for that.
             .map(|e| ProcessedToDeviceEvent::PlainText(e.clone()))
             .collect();