Revert D86875 "[Flang][NFC] Remove license comments from files in docs/ folder."
This reverts commit f787c9a90c69f, this was causing some build issues.
diff --git a/flang/docs/RuntimeDescriptor.md b/flang/docs/RuntimeDescriptor.md
index a8eff33..d819517 100644
--- a/flang/docs/RuntimeDescriptor.md
+++ b/flang/docs/RuntimeDescriptor.md
@@ -1,3 +1,11 @@
+<!--===- docs/RuntimeDescriptor.md
+
+ Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+ See https://llvm.org/LICENSE.txt for license information.
+ SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+-->
+
## Concept
The properties that characterize data values and objects in Fortran
programs must sometimes be materialized when the program runs.
