Update testing-your-ssh-connection.md (#2220)

* Update testing-your-ssh-connection.md

The edited language was confusing and incorrect. See https://github.community/t/ssh-fingerprint-matching-issue/150693

* Avoid hardcoded github.com domain in docs link

PR won't pass required tests without this change.

Co-authored-by: hubwriter <hubwriter@github.com>

Author: charlescurley

content/github/authenticating-to-github/testing-your-ssh-connection.md

@@ -31,7 +31,7 @@ When you test your connection, you'll need to authenticate this action using you
   > Are you sure you want to continue connecting (yes/no)?
   ```
 
-3. Verify that the fingerprint in the message you see matches one of the messages in step 2, then type `yes`:
+3. Verify that the fingerprint in the message you see matches one of the [Github fingerprints](/github/authenticating-to-github/githubs-ssh-key-fingerprints). If it does, then type `yes`:
   ```shell
   > Hi <em>username</em>! You've successfully authenticated, but GitHub does not
   > provide shell access.