docs: add sha256 checksums for 11.1.2

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit e49dd21bcbabdb330620d48f5915828cfd5eb983)
diff --git a/docs/relnotes/11.1.2.html b/docs/relnotes/11.1.2.html
index 947dcbf..43938a6 100644
--- a/docs/relnotes/11.1.2.html
+++ b/docs/relnotes/11.1.2.html
@@ -31,7 +31,8 @@
 
 <h2>SHA256 checksums</h2>
 <pre>
-TBD
+ba0e7462b2936b86e6684c26fbb55519f8d9ad31d13a1c1e1afbe41e73466eea  mesa-11.1.2.tar.gz
+8f72aead896b340ba0f7a4a474bfaf71681f5d675592aec1cb7ba698e319148b  mesa-11.1.2.tar.xz
 </pre>