meta: Update comment about unsupported texture types.

Ken added support for 2DArray (commit ec23d5197e) and 1DArray (commit
14ca61125) last year.

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>

src/mesa/drivers/common/meta_generate_mipmap.c

@@ -150,8 +150,7 @@ prepare_mipmap_level(struct gl_context *ctx,
 
 /**
  * Called via ctx->Driver.GenerateMipmap()
- * Note: We don't yet support 3D textures, 1D/2D array textures or texture
- * borders.
+ * Note: We don't yet support 3D textures, or texture borders.
  */
 void
 _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,