features: mark off textureGather for zink

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <!8151>

docs/features.txt

@@ -122,7 +122,7 @@ GL 4.0, GLSL 4.00 --- all DONE: i965/gen7+, nvc0, r600, radeonsi, llvmpipe, virg
   - Implicit signed -> unsigned conversions             DONE (softpipe, swr)
   - Fused multiply-add                                  DONE (softpipe, swr)
   - Packing/bitfield/conversion functions               DONE (freedreno, softpipe, swr)
-  - Enhanced textureGather                              DONE (freedreno, softpipe, swr)
+  - Enhanced textureGather                              DONE (freedreno, softpipe, swr, zink)
   - Geometry shader instancing                          DONE (softpipe, swr)
   - Geometry shader multiple streams                    DONE (softpipe, swr)
   - Enhanced per-sample shading                         DONE ()
@@ -134,7 +134,7 @@ GL 4.0, GLSL 4.00 --- all DONE: i965/gen7+, nvc0, r600, radeonsi, llvmpipe, virg
   GL_ARB_tessellation_shader                            DONE (i965/gen7+, swr, zink)
   GL_ARB_texture_buffer_object_rgb32                    DONE (freedreno, i965/gen6+, softpipe, swr, d3d12, zink)
   GL_ARB_texture_cube_map_array                         DONE (i965/gen6+, nv50, softpipe, swr, zink)
-  GL_ARB_texture_gather                                 DONE (freedreno, i965/gen6+, nv50, softpipe, swr, v3d, panfrost)
+  GL_ARB_texture_gather                                 DONE (freedreno, i965/gen6+, nv50, softpipe, swr, v3d, panfrost, zink)
   GL_ARB_texture_query_lod                              DONE (freedreno, i965, nv50, softpipe, swr, v3d, panfrost, zink, d3d12)
   GL_ARB_transform_feedback2                            DONE (i965/gen6+, nv50, softpipe, swr, v3d, panfrost, zink)
   GL_ARB_transform_feedback3                            DONE (i965/gen7+, softpipe, swr, zink)