fix some typos

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    <p>It is not possible to customize the error log by adding or

    removing information. However, error log entries dealing with

    particular requests have corresponding entries in the <a

    href="#accesslog">access log</a>. For example, the above example

    href="#accesslog">access log</a>. For instance, the above example

    entry corresponds to an access log entry with status code 403.

    Since it is possible to customize the access log, you can

    obtain more information about error conditions using that log

        <dd>The "hyphen" in the output indicates that the requested

        piece of information is not available. In this case, the

        information that is not available is the RFC 1413 identity of

        the client determined by <code>identd</code> on the clients

        the client determined by <code>identd</code> on the client's

        machine. This information is highly unreliable and should

        almost never be used except on tightly controlled internal

        networks. Apache httpd will not even attempt to determine

      </example>

      <p>Although we have just shown that conditional logging is very

      powerful and flexibly, it is not the only way to control the

      powerful and flexible, it is not the only way to control the

      contents of the logs. Log files are more useful when they

      contain a complete record of server activity. It is often

      easier to simply post-process the log files to remove requests