docs: Note that GL_ARB_viewport_array is done on i965

At least for GEN7+, anyway.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

docs/relnotes/10.1.html

@@ -46,6 +46,7 @@ Note: some of the new features are only available with certain drivers.
 <ul>
 <li>GL_ARB_draw_indirect on i965.</li>
 <li>GL_ARB_clear_buffer_object</li>
+<li>GL_ARB_viewport_array on i965.</li>
 <li>GL_AMD_shader_trinary_minmax.</li>
 <li>Reduced memory usage for display lists.</li>
 </ul>