docs: Fix typo in extension name

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
diff --git a/docs/relnotes/12.1.0.html b/docs/relnotes/12.1.0.html
index 50d93c2..e7c3a52 100644
--- a/docs/relnotes/12.1.0.html
+++ b/docs/relnotes/12.1.0.html
@@ -47,7 +47,7 @@
 <li>GL_ARB_shader_group_vote on nvc0</li>
 <li>GL_ARB_ES3_1_compatibility on i965</li>
 <li>GL_EXT_window_rectangles on nv50, nvc0</li>
-<li>KHR_texture_compression_astc_sliced_3d on i965</li>
+<li>GL_KHR_texture_compression_astc_sliced_3d on i965</li>
 </ul>
 
 <h2>Bug fixes</h2>