changes: it's not just invalid UTF-8 sequences that are affected...

It isn't just invalid UTF-8 sequences that are affected; it is in fact
any high-bit bytes (we don't ever try to construct UTF-8 characters,
just deconstruct them.)

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/doc/changes.src b/doc/changes.src
index df96ebc..25b0b5c 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -37,8 +37,8 @@
 
 \b Support for 64-bit Mach-O output, see \k{machofmt}.
 
-\b Fix assert failure on certain operations that involve high-bit
-  characters that don't form valid UTF-8 sequences.
+\b Fix assert failure on certain operations that involve strings with
+  high-bit bytes.
 
 
 \S{cl-2.06} Version 2.06