Clarify docs for LimitRequestLine, as per bug #51665.

    that will be allowed in an HTTP request header.</p>

    <p>The <directive>LimitRequestFieldSize</directive> directive

    allows the server administrator to reduce or increase the limit

    allows the server administrator to set the limit

    on the allowed size of an HTTP request header field. A server

    needs this value to be large enough to hold any one header field

    from a normal client request. The size of a normal request header

    </example>

    <note>Under normal conditions, the value should not be changed from

    the default.</note>

    the default. Also, you can't set this higher than 8190 without

    modifying the source code and rebuilding.</note>

    <note type="warning"><title>Warning</title>

    <p> When name-based virtual hosting is used, the value for this

    allowed on the HTTP request-line.</p>

    <p>The <directive>LimitRequestLine</directive> directive allows

    the server administrator to reduce or increase the limit on the allowed size

    the server administrator to set the limit on the allowed size

    of a client's HTTP request-line. Since the request-line consists of the

    HTTP method, URI, and protocol version, the

    <directive>LimitRequestLine</directive> directive places a

    </example>

    <note>Under normal conditions, the value should not be changed from

    the default.</note>

    the default. Also, you can't set this higher than 8190 without

    modifying the source and rebuilding.</note>

    <note type="warning"><title>Warning</title>

    <p> When name-based virtual hosting is used, the value for this