changes.src: document %exitrep/%exitmacro %if fix

Add the fix for %exitrep/%exitmacro to the release notes.

Signed-off-by: H. Peter Anvin (Intel) <[email protected]>

Author: H. Peter Anvin

doc/changes.src

@@ -10,11 +10,18 @@ evolving code simpler.
 
 It is the production version of NASM since 2025.
 
+
 \S{cl-3.01} Version 3.01
 
 \b A new \c{obj2} version of the \c{obj} output format, intended for
    use on OS/2. See \k{obj2fmt}.
 
+\b The condition after \c{%if} or \c{%elif} would be evaluated while
+   output is suppressed after \c{%exitrep} or \c{%exitmacro}. Although
+   no output would be generated in either case, assembly would fail if
+   evaluating the expression triggered an error.
+
+
 \S{cl-3.00} Version 3.00
 
 \b Improve the documentation for building from source (\k{source}).