Fix overlapping release note entries

RELEASES.txt

@@ -342,8 +342,9 @@ Planned
 
 * Serialize negative zero as '-0' in JSONX and JSONC
 
-* Some typing changes in the public API to improve portability; may require
-  changes to calling code
+* Public API C typing wrapped behind typedefs to allow porting to more exotic
+  platforms, e.g. platforms where "int" is a 16-bit type; API docs updated to
+  describe how type wrapping affects calling code (see new section "C types")
 
 * Rename some feature options (DUK_OPT_xxx) for consistency, please check
   any options you use against the up-to-date options list
@@ -380,10 +381,6 @@ Planned
 * Add a safety limit for compiled bytecode byte size and maximum line number
   used to ensure pc-to-line internal data structure limits are not exceeded
 
-* Public API C typing wrapped behind typedefs to allow porting to more exotic
-  platforms, e.g. platforms where "int" is a 16-bit type; API docs updated to
-  describe how type wrapping affects calling code
-
 * Fix a number conversion related incorrect assertion triggered by the
   test262 test suite