docs: Use C-style comments in TLS presentation syntax.
@@ -237,7 +237,7 @@ impl Signable for GroupInfoTBS {
/// Extension extensions<V>;
/// MAC confirmation_tag;
/// uint32 signer;
-/// // SignWithLabel(., "GroupInfoTBS", GroupInfoTBS)
+/// /* SignWithLabel(., "GroupInfoTBS", GroupInfoTBS) */
/// opaque signature<V>;
/// } GroupInfo;
/// ```
