[librsvg/librsvg-2.48] Fix obsolete comment

[Federico Mena Quintero <federico src gnome org>]

commit f7f74629b1723162e2bfb7e421a86e22401958f3
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Apr 22 11:36:32 2020 -0500

    Fix obsolete comment

 rsvg_internals/src/length.rs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/rsvg_internals/src/length.rs b/rsvg_internals/src/length.rs
index a188baae..55a1383a 100644
--- a/rsvg_internals/src/length.rs
+++ b/rsvg_internals/src/length.rs
@@ -360,10 +360,9 @@ fn font_size_from_values(values: &ComputedValues, params: &ViewParams) -> f64 {
 
         LengthUnit::Px => v.length,
 
-        // This is the same default as used in Svg::get_size()
+        // The following implies that our default font size is 12, which
+        // matches the default from the FontSize property.
         LengthUnit::Em => v.length * 12.0,
-
-        // This is the same default as used in Svg::get_size()
         LengthUnit::Ex => v.length * 12.0 / 2.0,
 
         // FontSize always is a Both, per properties.rs