Update NEWS and remove the unnecessary UPGRADING note.

NEWS

@@ -6,6 +6,10 @@ PHP                                                                        NEWS
   . Fixed bug #65947 (basename is no more working after fgetcsv in certain 
     situation). (Laruence)
 
+- JSON
+  . Fixed whitespace part of bug #64874 ("json_decode handles whitespace and
+    case-sensitivity incorrectly"). (Andrea Faulds)
+
 - MySQLi:
   . Fixed bug #66043 (Segfault calling bind_param() on mysqli). (Laruence)
 

UPGRADING

@@ -492,16 +492,6 @@ b. Extensions with changed behavior
      - the output of the tiger hash family has been corrected, see
        https://bugs.php.net/61307
 
-   - JSON extension
-     - Fixed whitespace part of bug #64874 ("json_decode handles whitespace and
-       case-sensitivity incorrectly")
-       This means that leading and trailing whitespace when deserialising lone
-       JSON null, true, false, string and number values no longer causes an
-       error. Please note that this only applies to the deserialising of strings
-       containing only a null, true, false, string or number value. Leading and
-       trailing whitespace around and inside objects and arrays has never caused
-       an error.
-       
 ===========================
 10. Changes in SAPI support
 ===========================