Fix PASSWORD_DEFAULT constant type (#4181)

Also remove personalization while at it

Author: Girgias

reference/password/constants.xml

@@ -177,7 +177,7 @@
    <varlistentry xml:id="constant.password-default">
     <term>
      <constant>PASSWORD_DEFAULT</constant>
-     (<type>mixed</type>)
+     (<type>string</type>)
     </term>
     <listitem>
      <para>
@@ -186,22 +186,16 @@
       algorithms are supported.
      </para>
      <para>
-      It is worth noting that over time this constant can (and likely will)
-      change. Therefore you should be aware that the length of the resulting
-      hash can change. Therefore, if you use <constant>PASSWORD_DEFAULT</constant>
-      you should store the resulting hash in a way that can store more than 60
-      characters (255 is the recommended width).
-     </para>
-     <para>
-      Values for this constant:
+      It is worth noting that over time this constant can change.
+      It is thus important to be aware that the length of the resulting
+      hash can change.
+      Therefore, when using <constant>PASSWORD_DEFAULT</constant> the resulting
+      hash must be stored in a way that can store arbitrary hashes,
+      the recommended width is <literal>255</literal> bytes.
      </para>
-     <itemizedlist>
-      <listitem>
-       <simpara>
-        PHP 5.5.0 - <constant>PASSWORD_BCRYPT</constant>
-       </simpara>
-      </listitem>
-     </itemizedlist>
+     <simpara>
+      Currently is an alias for <constant>PASSWORD_BCRYPT</constant>.
+     </simpara>
     </listitem>
    </varlistentry>
   </variablelist>