Fix broken RST

Author: AaronBallman

clang/docs/ReleaseNotes.rst

@@ -148,7 +148,7 @@ C23 Feature Support
   better diagnostic behavior for the ``va_start()`` macro in C23 and later.
   This also updates the definition of ``va_start()`` in ``<stdarg.h>`` to use
   the new builtin. Fixes #GH124031.
-- Implemented ``WG14 N2819 <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2819.pdf`_
+- Implemented ``WG14 N2819 <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2819.pdf>`_
   which clarified that a compound literal used within a function prototype is
   treated as if the compound literal were within the body rather than at file
   scope.