changes: document CVT fixes.

Document fixes to the CVT instructions.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/doc/changes.src b/doc/changes.src
index 352bbd6..b1fa65f 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -28,6 +28,8 @@
 \b Fix error where NASM would generate a spurious warning on valid
   optimizations of immediate values.
 
+\b Fix arguments to a number of the \c{CVT} SSE instructions.
+
 
 \S{cl-2.04} Version 2.04