docs: add sha256 checksums for 17.2.5

Signed-off-by: Andres Gomez <agomez@igalia.com>
diff --git a/docs/relnotes/17.2.5.html b/docs/relnotes/17.2.5.html
index 282e200..9d145e6 100644
--- a/docs/relnotes/17.2.5.html
+++ b/docs/relnotes/17.2.5.html
@@ -31,7 +31,8 @@
 
 <h2>SHA256 checksums</h2>
 <pre>
-TBD
+25b40e72fad64b096c2d8d6fe9579369954debe7970d4ad53e5033c7eec2918b  mesa-17.2.5.tar.gz
+7f7f914b7b9ea0b15f2d9d01a4375e311b0e90e55683b8e8a67ce8691eb1070f  mesa-17.2.5.tar.xz
 </pre>