message: Doc: Add missing link to fishshell
diff: # Implicit `cd`
  -Like the [Friendly Interactive Shell](), Ion also supports executing the `cd` command automatically
  +Like the [Friendly Interactive Shell](https://fishshell.com/), Ion also supports
  +executing the `cd` command automatically
  when given a path. Paths are denoted by beginning with `.`/`/`/`~`, or ending with `/`.
  ```ion
  