This typo was introduced four years ago when para_fade was renamed
to para_mixer.
Fixes: 7031f4e380b429e9c0eea1b8e5484dabdbb12ae5
[<a href="para_filter.man.html">para_filter</a>]
[<a href="para_write.man.html">para_write</a>]
[<a href="para_gui.man.html">para_gui</a>]
[<a href="para_filter.man.html">para_filter</a>]
[<a href="para_write.man.html">para_write</a>]
[<a href="para_gui.man.html">para_gui</a>]
- [<a href="para_mixer.man.html">para_mixere</a>]
+ [<a href="para_mixer.man.html">para_mixer</a>]
[<a href="para_play.man.html">para_play</a>]
</p>
[<a href="para_play.man.html">para_play</a>]
</p>