docs: update nv50 support

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
diff --git a/docs/GL3.txt b/docs/GL3.txt
index 54a0c51..5261eda 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -106,8 +106,8 @@
   GL_ARB_shader_subroutine                             not started
   GL_ARB_tessellation_shader                           not started
   GL_ARB_texture_buffer_object_rgb32                   DONE (i965, r600, radeonsi, softpipe)
-  GL_ARB_texture_cube_map_array                        DONE (i965, nvc0, r600, softpipe)
-  GL_ARB_texture_gather                                DONE (i965)
+  GL_ARB_texture_cube_map_array                        DONE (i965, nv50, nvc0, r600, softpipe)
+  GL_ARB_texture_gather                                DONE (i965, nv50)
   GL_ARB_transform_feedback2                           DONE (i965, nv50, nvc0, r600, radeonsi)
   GL_ARB_transform_feedback3                           DONE (i965, nv50, nvc0, r600, radeonsi)