fix redaction link in index

Author: tony-xlh

api/class/index.md

@@ -32,6 +32,7 @@ Annotation has the following main classes:
 
 
 - [Rectangle](/api/class/annotation/rectangle.md)
+- [Redaction](/api/class/annotation/redaction.md)
 - [Ellipse](/api/class/annotation/ellipse.md)
 - [Polygon](/api/class/annotation/polygon.md)
 - [Polyline](/api/class/annotation/polyline.md)

api/index.md

@@ -33,7 +33,7 @@ permalink: /api/index.html
 
 - Annotation
     - [Rectangle]({{ site.api }}class/annotation/rectangle.html)
-    - [Redaction](/api/class/annotation/rectangle.md)
+    - [Redaction](/api/class/annotation/redaction.md)
     - [Ellipse]({{ site.api }}class/annotation/ellipse.html)
     - [Polygon]({{ site.api }}class/annotation/polygon.html)
     - [Polyline]({{ site.api }}class/annotation/polyline.html)