Add anchors to both long and short option names

[joostas]

Hi,

Currently generated HTML content adds one anchor to option description.
I.e for option -O --remote-name it generates this output:

<p class="level0"><a name="-O"></a><span class="nroffip">-O, --remote-name</span>
</p>

Would be nice if tool could include anchors for both option versions:

<p class="level0"><a name="-O"></a><a name="--remote-name"></a><span class="nroffip">-O, --remote-name</span>
</p>

It would improve searchability on site.
Both links
https://curl.haxx.se/docs/manpage.html#-O
https://curl.haxx.se/docs/manpage.html#--remote-name
would directly show needed information.