[OpenACC] Fix comments on OpenACC enum to use ///

clang/include/clang/Basic/OpenACCKinds.h

@@ -72,25 +72,25 @@ enum class OpenACCAtomicKind {
 
 /// Represents the kind of an OpenACC clause.
 enum class OpenACCClauseKind {
-  // 'finalize' clause, allowed on 'exit data' directive.
+  /// 'finalize' clause, allowed on 'exit data' directive.
   Finalize,
-  // 'if_present' clause, allowed on 'host_data' and 'update' directives.
+  /// 'if_present' clause, allowed on 'host_data' and 'update' directives.
   IfPresent,
-  // 'seq' clause, allowed on 'loop' and 'routine' directives.
+  /// 'seq' clause, allowed on 'loop' and 'routine' directives.
   Seq,
-  // 'independent' clause, allowed on 'loop' directives.
+  /// 'independent' clause, allowed on 'loop' directives.
   Independent,
-  // 'auto' clause, allowed on 'loop' directives.
+  /// 'auto' clause, allowed on 'loop' directives.
   Auto,
-  // 'worker' clause, allowed on 'loop' and 'routine' directives.
+  /// 'worker' clause, allowed on 'loop' and 'routine' directives.
   Worker,
-  // 'vector' clause, allowed on 'loop' and 'routine' directives. Takes no
-  // arguments for 'routine', so the 'loop' version is not yet implemented
-  // completely.
+  /// 'vector' clause, allowed on 'loop' and 'routine' directives. Takes no
+  /// arguments for 'routine', so the 'loop' version is not yet implemented
+  /// completely.
   Vector,
-  // 'nohost' clause, allowed on 'routine' directives.
+  /// 'nohost' clause, allowed on 'routine' directives.
   NoHost,
-  // Represents an invalid clause, for the purposes of parsing.
+  /// Represents an invalid clause, for the purposes of parsing.
   Invalid,
 };
 } // namespace clang