crypto: Use encryption info in the docstring for the type of the same name

Co-authored-by: Jonas Platte <jplatte@users.noreply.github.com>

matrix_sdk_common/src/deserialized_responses.rs

@@ -90,7 +90,7 @@ pub struct EncryptionInfo {
 }
 
 /// A customized version of a room event coming from a sync that holds optional
-/// decryption info.
+/// encryption info.
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct SyncRoomEvent {
     /// The actual event.