Split the mb_detect_encoding() screens at PHP 8.3

The non-strict change landed in 8.3.0, so 8.2 still prints the old result
and one screen cannot cover both. The basic example is split too: its
screen already showed only the 8.3 behaviour.

Author: KentarouTakeda

reference/mbstring/functions/mb-detect-encoding.xml

@@ -158,7 +158,16 @@ var_dump(mb_detect_encoding($str, $encodings));
 ?>
 ]]>
     </programlisting>
-    &example.outputs;
+    &example.outputs.82;
+    <screen>
+<![CDATA[
+bool(false)
+bool(false)
+string(8) "SJIS-win"
+bool(false)
+]]>
+    </screen>
+    &example.outputs.83;
     <screen>
 <![CDATA[
 string(5) "ASCII"
@@ -189,7 +198,16 @@ var_dump(mb_detect_encoding($str, ['ASCII', 'UTF-8', 'ISO-8859-1'], true));
 ?>
 ]]>
     </programlisting>
-    &example.outputs;
+    &example.outputs.82;
+    <screen>
+<![CDATA[
+string(5) "UTF-8"
+bool(false)
+string(10) "ISO-8859-1"
+string(10) "ISO-8859-1"
+]]>
+    </screen>
+    &example.outputs.83;
     <screen>
 <![CDATA[
 string(5) "ASCII"