docs: mark ARB_texture_gather as done on nvc0

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
diff --git a/docs/GL3.txt b/docs/GL3.txt
index d9cc708..bf51e3a 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -107,7 +107,7 @@
   GL_ARB_tessellation_shader                           not started
   GL_ARB_texture_buffer_object_rgb32                   DONE (i965, nvc0, r600, radeonsi, softpipe)
   GL_ARB_texture_cube_map_array                        DONE (i965, nv50, nvc0, r600, softpipe)
-  GL_ARB_texture_gather                                DONE (i965, nv50)
+  GL_ARB_texture_gather                                DONE (i965, nv50, nvc0)
   GL_ARB_transform_feedback2                           DONE (i965, nv50, nvc0, r600, radeonsi)
   GL_ARB_transform_feedback3                           DONE (i965, nv50, nvc0, r600, radeonsi)