shaper: purge outdated comment

HarfBuzz has been able to disable fallback kerning since commit
038c98f6. Add some more useful docstrings instead.

diff --git a/libass/ass_shaper.c b/libass/ass_shaper.c
index 98f2259ca4b0929c39342fe27b0785eceb884fde..41a48ef0b9461ddac2acbab51866368fe26c15fc 100644 (file)
--- a/libass/ass_shaper.c
+++ b/libass/ass_shaper.c
@@ -702,8 +702,8 @@ static void shape_fribidi(ASS_Shaper *shaper, GlyphInfo *glyphs, size_t len)
 
 /**
  * \brief Toggle kerning for HarfBuzz shaping.
- * NOTE: currently only works with OpenType fonts, the TrueType fallback *always*
- * kerns. It's a bug in HarfBuzz.
+ * \param shaper shaper instance
+ * \param kern toggle kerning
  */
 void ass_shaper_set_kerning(ASS_Shaper *shaper, int kern)
 {