Move the release note template content to the end of file (#1795)

Fix the issue that the release notes cannot be successfully created when
releasing a new version.

RELEASE_NOTES.md

@@ -1,17 +1,3 @@
-## WAMR-X.Y.Z
-
-### Breaking Changes
-
-### New Features
-
-### Bug Fixes
-
-### Enhancements
-
-### Others
-
----
-
 ## WAMR-1.1.2
 
 ### Breaking Changes
@@ -225,3 +211,17 @@ Enable spec test on nuttx and daily run it
 - Fix build error on alios platform
 
 ---
+
+## WAMR-X.Y.Z
+
+### Breaking Changes
+
+### New Features
+
+### Bug Fixes
+
+### Enhancements
+
+### Others
+
+---