Fix for internal anchor links in the build script.

[ardour-manual] / include / monitoring.html

<p>
  When recording, it is important that performers hear themselves, and any
  pre-recorded tracks they are performing with.
</p>
<p>
  Audio recorders typically allow <dfn>monitoring</dfn> (i.e. listening to)
  the input signal of all tracks that are armed for recording, and playing
  back the unarmed tracks.
</p>