docs: consolidate r600 entry in GL3.txt

Though fp64 emulation still needs to be done for a lot of the evergreen hw.
diff --git a/docs/GL3.txt b/docs/GL3.txt
index 0051cb8..50b429c 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -92,11 +92,11 @@
   GL_ARB_vertex_type_2_10_10_10_rev                     DONE ()
 
 
-GL 4.0, GLSL 4.00 --- all DONE: nvc0, radeonsi
+GL 4.0, GLSL 4.00 --- all DONE: nvc0, r600, radeonsi
 
-  GL_ARB_draw_buffers_blend                            DONE (i965, nv50, r600, llvmpipe, softpipe)
-  GL_ARB_draw_indirect                                 DONE (i965, r600, llvmpipe, softpipe)
-  GL_ARB_gpu_shader5                                   DONE (i965, r600)
+  GL_ARB_draw_buffers_blend                            DONE (i965, nv50, llvmpipe, softpipe)
+  GL_ARB_draw_indirect                                 DONE (i965, llvmpipe, softpipe)
+  GL_ARB_gpu_shader5                                   DONE (i965)
   - 'precise' qualifier                                DONE
   - Dynamically uniform sampler array indices          DONE (softpipe)
   - Dynamically uniform UBO array indices              DONE ()
@@ -109,16 +109,16 @@
   - Enhanced per-sample shading                        DONE ()
   - Interpolation functions                            DONE ()
   - New overload resolution rules                      DONE
-  GL_ARB_gpu_shader_fp64                               DONE (r600, llvmpipe, softpipe)
-  GL_ARB_sample_shading                                DONE (i965, nv50, r600)
-  GL_ARB_shader_subroutine                             DONE (i965, nv50, r600, llvmpipe, softpipe)
-  GL_ARB_tessellation_shader                           DONE (r600)
-  GL_ARB_texture_buffer_object_rgb32                   DONE (i965, r600, llvmpipe, softpipe)
-  GL_ARB_texture_cube_map_array                        DONE (i965, nv50, r600, llvmpipe, softpipe)
-  GL_ARB_texture_gather                                DONE (i965, nv50, r600, llvmpipe, softpipe)
-  GL_ARB_texture_query_lod                             DONE (i965, nv50, r600, softpipe)
-  GL_ARB_transform_feedback2                           DONE (i965, nv50, r600, llvmpipe, softpipe)
-  GL_ARB_transform_feedback3                           DONE (i965, nv50, r600, llvmpipe, softpipe)
+  GL_ARB_gpu_shader_fp64                               DONE (llvmpipe, softpipe)
+  GL_ARB_sample_shading                                DONE (i965, nv50)
+  GL_ARB_shader_subroutine                             DONE (i965, nv50, llvmpipe, softpipe)
+  GL_ARB_tessellation_shader                           DONE ()
+  GL_ARB_texture_buffer_object_rgb32                   DONE (i965, llvmpipe, softpipe)
+  GL_ARB_texture_cube_map_array                        DONE (i965, nv50, llvmpipe, softpipe)
+  GL_ARB_texture_gather                                DONE (i965, nv50, llvmpipe, softpipe)
+  GL_ARB_texture_query_lod                             DONE (i965, nv50, softpipe)
+  GL_ARB_transform_feedback2                           DONE (i965, nv50, llvmpipe, softpipe)
+  GL_ARB_transform_feedback3                           DONE (i965, nv50, llvmpipe, softpipe)
 
 
 GL 4.1, GLSL 4.10 --- all DONE: nvc0, radeonsi