Editorial: Restrict GetNamedTimeZoneOffsetNanoseconds return values less than 24 hours

Fixes #3101

Author: anba

spec.html

@@ -32967,7 +32967,7 @@ <h1>
           GetNamedTimeZoneOffsetNanoseconds (
             _timeZoneIdentifier_: a String,
             _epochNanoseconds_: a BigInt,
-          ): an integer
+          ): an integer in the exclusive interval from -8.64 × 10<sup>13</sup> to 8.64 × 10<sup>13</sup>
         </h1>
         <dl class="header">
         </dl>
@@ -33503,7 +33503,7 @@ <h1>
           <h1>
             ParseTimeZoneOffsetString (
               _offsetString_: a String,
-            ): an integer
+            ): an integer in the exclusive interval from -8.64 × 10<sup>13</sup> to 8.64 × 10<sup>13</sup>
           </h1>
           <dl class="header">
             <dt>description</dt>