[skip ci] Also add ReflectionProperty::is{Readable,Writable}() to NEWS

Also fix typo (missing and), and align message with rest of the doc.

Author: iluuu1994

NEWS

@@ -87,6 +87,8 @@ PHP                                                                        NEWS
   . Fixed bug GH-20217 (ReflectionClass::isIterable() incorrectly returns true
     for classes with property hooks). (alexandre-daubois)
   . Added ReflectionConstant::inNamespace(). (Khaled Alam)
+  . Added ReflectionProperty::isReadable() and ReflectionProperty::isWritable().
+    (ilutov)
 
 - Session:
   . Fixed bug 71162 (updateTimestamp never called when session data is empty).

UPGRADING

@@ -134,8 +134,8 @@ PHP 8.6 UPGRADE NOTES
 
 - Reflection:
   . ReflectionConstant::inNamespace()
-  . ReflectionProperty::isReadable() ReflectionProperty::isWritable() were
-    added.
+  . Added ReflectionProperty::isReadable() and ReflectionProperty::isWritable().
+    RFC: https://wiki.php.net/rfc/isreadable-iswriteable
 
 - Standard:
   . `clamp()` returns the given value if in range, else return the nearest