[librsvg: 9/23] Missing docs for a no-op function.

[Marge Bot <marge-bot src gnome org>]

commit f7c62643df793514b15fcc61bcae11af720b05a5
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Jan 6 14:30:15 2022 -0600

    Missing docs for a no-op function.
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/650>

 include/librsvg/rsvg.h | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/include/librsvg/rsvg.h b/include/librsvg/rsvg.h
index b660a4056..8b8b07d8e 100644
--- a/include/librsvg/rsvg.h
+++ b/include/librsvg/rsvg.h
@@ -440,6 +440,8 @@ struct _RsvgRectangle {
 /**
  * rsvg_cleanup:
  *
+ * This function does nothing.
+ *
  * Since: 2.36
  * Deprecated: 2.46: No-op. This function should not be called from normal programs.
  */