sync note with trunk

    <note><title>Note</title>

    <p>If no handler is explicitly set for a request, the specified content

    type will also be used as the handler name. </p>

    <p>When explicit directives such as

    <directive module="core" >SetHandler</directive> or

    <directive module="mod_mime">AddHandler</directive> do not apply

    to the current request, the internal handler name normally set by those

    directives is set to match the content type specified by this directive.  

    This is a historical behavior that some third-party modules 

    (such as mod_php) may use "magic" content types used only to signal the 

    module to take responsibility for the matching request.  Configurations

    that rely on such "magic" types should be avoided by the use of 

    directives is instead set to the content type specified by this directive.

    </p>

    <p>

    This is a historical behavior that may be used by some third-party modules

    (such as mod_php) for taking responsibility for the matching request.

    </p>

    <p>Configurations that rely on such "synthetic" types should be avoided.

    Additionally, configurations that restrict access to

    <directive module="core" >SetHandler</directive> or

    <directive module="mod_mime">AddHandler</directive>. </p>

    <directive module="mod_mime">AddHandler</directive> should

    restrict access to this directive as well.</p>

    </note>

</usage>