Fix formatting of warning

Signed-off-by: Sumner Evans <sumner@beeper.com>

content/client-server-api/modules/end_to_end_encryption.md

@@ -1368,14 +1368,14 @@ The `session_data` field in the backups is constructed as follows:
     The first 8 bytes of the resulting MAC are base64-encoded, and become the
     `mac` property of the `session_data`.
 
-    {{% boxes/warning %}}
-    This was intended to pass the raw encrypted data, but due to a bug in
-    libolm, all implementations have since passed an empty string instead.
-
-    Future versions of the spec will fix this problem. See
-    [MSC4048](https://github.com/matrix-org/matrix-spec-proposals/pull/4048)
-    for a potential new key backup algorithm version that would fix this issue.
-    {{% /boxes/warning %}}
+{{% boxes/warning %}}
+Step 5 was intended to pass the raw encrypted data, but due to a bug in libolm,
+all implementations have since passed an empty string instead.
+
+Future versions of the spec will fix this problem. See
+[MSC4048](https://github.com/matrix-org/matrix-spec-proposals/pull/4048) for a
+potential new key backup algorithm version that would fix this issue.
+{{% /boxes/warning %}}
 
 {{% definition path="api/client-server/definitions/key_backup_session_data" %}}