HDFS-13420. License header is displayed in ArchivalStorage/MemoryStorage html pages. Contributed by Akira Ajisaka.

(cherry picked from commit 6729047a8ba273d27edcc6a1a9d397a096f44d84)

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md

@@ -1,4 +1,4 @@
-<!---
+<!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/MemoryStorage.md

@@ -1,4 +1,4 @@
-<!---
+<!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at