ovn-nbctl: Fix documentation for "ovn-nbctl acl-add".
The range of "PRIORITY" for "ovn-nbctl acl-add " command is 1 to 65534 in
ovn-nbctl.8.xml",When configuring this command, it indicates that "
priority must in range 0...32767".The range of priority is inconsistent
in "ovn-nbctl.8.xml" and "ovn-nbctl.c".
Adds the specified ACL to <var>switch</var>.
<var>direction</var> must be either <code>from-lport</code> or
<code>to-lport</code>. <var>priority</var> must be between
- <code>1</code> and <code>65534</code>, inclusive. If
+ <code>0</code> and <code>32767</code>, inclusive. If
<code>--log</code> is specified, packet logging is enabled for the
ACL. A full description of the fields are in <code>ovn-nb</code>(5).
</dd>
