docs: mark ARB_conservative_depth done on i965

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
diff --git a/docs/relnotes/9.3.html b/docs/relnotes/9.3.html
index 78ccd9e..58a88b0 100644
--- a/docs/relnotes/9.3.html
+++ b/docs/relnotes/9.3.html
@@ -45,6 +45,7 @@
 
 <ul>
 <li>GL_AMD_seamless_cubemap_per_texture on i965.</li>
+<li>GL_ARB_conservative_depth on i965.</li>
 <li>GL_ARB_texture_gather on i965.</li>
 <li>GL_ARB_texture_query_levels on i965.</li>
 <li>GL_KHR_debug</li>