Added Doxygen for v20.0.0.2

Change-Id: I8cef3a041af0482a92f28c15d5656d0efea9e525
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/30114
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/_data/documentation.yml b/_data/documentation.yml
index 3ba0d74..d438fc9 100755
--- a/_data/documentation.yml
+++ b/_data/documentation.yml
@@ -28,6 +28,8 @@
           url: http://doxygen.gem5.org/release/v19-0-0-0/index.html
         - page: v20.0.0.0
           url: http://doxygen.gem5.org/release/v20-0-0-0/index.html
+        - page: v20.0.0.2
+          url: http://doxygen.gem5.org/release/v20-0-0-2/index.html
 
     - title: gem5 Resources
       id: gem5_resources
@@ -259,4 +261,4 @@
     items:
         - title: Working Status of Benchmarks
           id: benchmark_status
-          url: /documentation/benchmark_status
\ No newline at end of file
+          url: /documentation/benchmark_status