NEWS.md: set code format explicitly [ci skip]

It is not set by default in the Github viewer.

1 files changed, 1 insertions, 1 deletions

diff --git a/NEWS.md b/NEWS.md
index a53f4f22a4..4485a64df4 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -34,7 +34,7 @@ sufficient information, see the ChangeLog file or Redmine
 
 * Regexp literals are frozen [[Feature #8948]] [[Feature #16377]]
 
-    ```
+    ```ruby
     /foo/.frozen? #=> true
     ```