docs: Document that i965 Gen6+ requires Kernel 3.6 or later

Cc: "9.2" mesa-stable@lists.freedesktop.org
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
diff --git a/docs/relnotes/9.2.html b/docs/relnotes/9.2.html
index 4e419f1..b9308eb 100644
--- a/docs/relnotes/9.2.html
+++ b/docs/relnotes/9.2.html
@@ -71,7 +71,8 @@
 the (unsupported) GDI driver.</li>
 <li>GL_EXT_separate_shader_objects has been removed from all Gallium drivers,
     because it disallows a critical GLSL shader optimization.
-    GL_ARB_separate_shader_objects doesn't have this issue.
+    GL_ARB_separate_shader_objects doesn't have this issue.</li>
+<li>i965 Gen6+ requires Kernel 3.6 or later. (92d2f5a)</li>
 </ul>
 
 </div>