add notes on www prefixes and mail.i2p

i2p2www/pages/site/docs/naming.html

 {% extends "global/layout.html" %}
 {% block title %}{% trans %}Naming and Address Book{% endtrans %}{% endblock %}
-{% block lastupdated %}2023-11{% endblock %}
-{% block accuratefor %}0.9.59{% endblock %}
+{% block lastupdated %}2025-01{% endblock %}
+{% block accuratefor %}0.9.65{% endblock %}
 {% block content %}
 <h2 id="overview">{% trans %}Overview{% endtrans %}</h2>
 
@@ -300,7 +300,15 @@ Base32 hostnames (*.b32.i2p) are reserved for base 32 use and so are not allowed
 
 <li>{% trans -%}
 Certain hostnames reserved for project use are not allowed
-(proxy.i2p, router.i2p, console.i2p, *.proxy.i2p, *.router.i2p, *.console.i2p, and others)
+(proxy.i2p, router.i2p, console.i2p, mail.i2p, *.proxy.i2p, *.router.i2p, *.console.i2p, *.mail.i2p, and others)
+{%- endtrans %}</li>
+
+<li>{% trans -%}
+Hostnames starting with 'www.' are discouraged and are rejected by some registration services.
+Some addressbook implementations automatically strip 'www.' prefixes from lookups.
+So registring 'www.example.i2p' is unnecessary,
+and registering a different destination for 'www.example.i2p' and 'example.i2p'
+will make 'www.example.i2p' unreachable for some users.
 {%- endtrans %}</li>
 
 <li>{% trans -%}