Fix a typo (r1756991 in trunk)

        <usage>

            <p>

                This directive influences how file content is handled in

                responses. When off, which is the default, file handles are 

                passed from the requestion processing down to the main

                responses. When <code>off</code>, which is the default, file handles

                are passed from the requestion processing down to the main

                connection, using the usual Apache setaside handling for

                manaaging the lifetime of the file.

                managing the lifetime of the file.

            </p>

            <p>

                When set to <code>on</code>, file content is copied while the

                An example for such a module is <code>mod_wsgi</code> that may place

                Python file handles into the response. Those files get close down when

                Python thinks processing has finished. That may be well before

                <code>mod_http2</code> is done with them.

                <module>mod_http2</module> is done with them.

            </p>

        </usage>

    </directivesynopsis>