Documentation of `myself` leaves out links

The [doc for `myself`](http://ccl.northwestern.edu/netlogo/docs/dictionary.html#myself) (as opposed to the [doc for `self`](http://ccl.northwestern.edu/netlogo/docs/dictionary.html#self)) only has icons for the turtle and patch contexts.

It also says that:

> "myself" means "the turtle or patch who asked me to do what I'm doing right now."

But `myself` can be used in the context of a link, and it can also refer to a link:

```
to go
  ca
  crt 2 [ create-links-with other turtles ]
  ; `myself` can be used in the context of a link:
  ask turtles [ ask my-links [ show myself ] ]
  ; `myself` can refer to a link:
  ask links [ ask both-ends [ show myself ] ]
end
```

(I have just encountered a new user who was lead to think otherwise by the docs.)