[librsvg] Mention that Loader is a builder pattern

[Federico Mena Quintero <federico src gnome org>]

commit 317169a67578b8ff3dd4a2e17729858261bd8f25
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Oct 31 09:24:22 2019 -0600

    Mention that Loader is a builder pattern

 librsvg_crate/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/librsvg_crate/src/lib.rs b/librsvg_crate/src/lib.rs
index f17647e3..df0d4747 100644
--- a/librsvg_crate/src/lib.rs
+++ b/librsvg_crate/src/lib.rs
@@ -108,7 +108,7 @@ pub use rsvg_internals::{
     RenderingError,
 };
 
-/// Struct for loading an [`SvgHandle`][SvgHandle].
+/// Builder for loading an [`SvgHandle`][SvgHandle].
 ///
 /// This is the starting point for using librsvg.  This struct
 /// implements a builder pattern for configuring an