Fix doc of mysqli_get_charset (#5411)

Author: kamil-tekiela

reference/mysqli/mysqli/get-charset.xml

@@ -51,7 +51,7 @@
     </varlistentry>
     <varlistentry>
      <term><parameter>dir</parameter></term>
-     <listitem><para>Directory the charset description was fetched from (?) or "" for built-in character sets</para></listitem>
+     <listitem><para>Directory the character set description was fetched from or "" for built-in character sets</para></listitem>
     </varlistentry>
     <varlistentry>
      <term><parameter>min_length</parameter></term>
@@ -67,7 +67,7 @@
     </varlistentry>
     <varlistentry>
      <term><parameter>state</parameter></term>
-     <listitem><para>Character set status (?)</para></listitem>
+     <listitem><para>As of PHP 8.2.0, it is always <literal>1</literal></para></listitem>
     </varlistentry>
    </variablelist>
   </para>
@@ -83,6 +83,7 @@
 <?php
   $db = mysqli_init();
   $db->real_connect("localhost","root","","test");
+  $db->set_charset('latin1');
   var_dump($db->get_charset());
 ?>
 ]]>
@@ -93,6 +94,7 @@
 <?php
   $db = mysqli_init();
   mysqli_real_connect($db, "localhost","root","","test");
+  mysqli_set_charset($db, 'latin1');
   var_dump(mysqli_get_charset($db));
 ?>
 ]]>
@@ -114,7 +116,7 @@ object(stdClass)#2 (7) {
   ["number"]=>
   int(8)
   ["state"]=>
-  int(801)
+  int(1)
 }
 ]]>
    </screen>