docs: add sha256 checksums for 11.1.1

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit 4b2d9f29e9b75cbbeb76ccf753a256e11f07ee1a)
diff --git a/docs/relnotes/11.1.1.html b/docs/relnotes/11.1.1.html
index 94e8660..3383f70 100644
--- a/docs/relnotes/11.1.1.html
+++ b/docs/relnotes/11.1.1.html
@@ -31,7 +31,8 @@
 
 <h2>SHA256 checksums</h2>
 <pre>
-TBD
+b15089817540ba0bffd0aad323ecf3a8ff6779568451827c7274890b4a269d58  mesa-11.1.1.tar.gz
+64db074fc514136b5fb3890111f0d50604db52f0b1e94ba3fcb0fe8668a7fd20  mesa-11.1.1.tar.xz
 </pre>