NEWS: fix markup of CONSTANTS_WITH_UNDERSCORES

Alas, I did not notice when when I originally applied the NEWS patch

diff --git a/NEWS b/NEWS
index f6ecbc7635096089516611e7513c125d7640ee40..0fd6d724ffec39092de582a1382bcbcee1285002 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -62,7 +62,7 @@ Add support for `notmuch_threads_t` and `notmuch_thread_t`
 Fixed constant values so they are not all zero anymore.
 
   Previously, it was impossible to open writable database handles,
-  because DATABASE_MODE_READ_ONLY and DATABASE_MODE_READ_WRITE were
+  because `DATABASE_MODE_READ_ONLY` and `DATABASE_MODE_READ_WRITE` were
   both set to zero.
   The same issue occured with sort modes.