changes.doc: document dwarf issue

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
diff --git a/doc/changes.src b/doc/changes.src
index 54a12e2..aad02a7 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -10,6 +10,7 @@
 \S{cl-2.13.03} Version 2.13.03
 
 \b Added AVX and AVX512 \c{VAES*} and \c{VPCLMULQDQ} instructions.
+\b Fixed missing dwarf record in x32 ELF output format.
 
 \S{cl-2.13.02} Version 2.13.02