Update get-sort-key.xml Fix extra */ (#4956)

Author: mmalferov

reference/intl/collator/get-sort-key.xml

@@ -70,6 +70,7 @@
     <programlisting role="php">
 <![CDATA[
 <?php
+
 $s1 = 'Hello';
 
 $coll = collator_create('en_US');
@@ -92,6 +93,7 @@ echo bin2hex($res);
     <programlisting role="php">
 <![CDATA[
 <?php
+
 $data = [
     [ 'name' => '🇳🇱 Derick Rethans', 'linked_account' => 'https://phpc.social/users/derickr' ],
     [ 'name' => 'Elephpant', 'linked_account' => 'https://phpc.social/phpc' ],
@@ -105,7 +107,6 @@ $col = new Collator('en');
 $col->setAttribute(Collator::CASE_FIRST, Collator::UPPER_FIRST);
 
 /* Use a user-defined function with sort, that strips out the emojis */
- */
 usort(
     $data,
     function($a, $b) use ($col) {