[pango] docs: Small addition

[Matthias Clasen <matthiasc src gnome org>]

commit ffdc738e9057b9202dc889dd87829dcd90f4d87a
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Nov 10 00:07:38 2021 -0500

    docs: Small addition
    
    Mention new attribute values in markup docs.

 docs/pango_markup.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/docs/pango_markup.md b/docs/pango_markup.md
index c9561fdf..dcabad93 100644
--- a/docs/pango_markup.md
+++ b/docs/pango_markup.md
@@ -158,9 +158,9 @@ baseline_shift
   or 'subscript'. Available since 1.50.
 
 font_scale:
-: Font size change. The possible values are 'superscript' or 'subscript'. This is
-  similar to the font_size values 'smaller' or 'larger', but uses font metrics to
-  find the new size. Available since 1.50.
+: Font size change. The possible values are 'superscript', 'subscript' or 'small-caps'.
+  This is similar to the font_size values 'smaller' or 'larger', but uses font metrics
+  to find the new size. Available since 1.50.
 
 strikethrough
 : 'true' or 'false' whether to strike through the text.