Reopened: Added update to "Adding your SSH key to the ssh-agent"

https://github.com/github/docs/pull/6782

content/github/authenticating-to-github/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent.md

@@ -177,6 +177,15 @@ Before adding a new SSH key to the ssh-agent to manage your keys, you should hav
   $ eval "$(ssh-agent -s)"
   > Agent pid 59566
   ```
+  However, for other such environments, a variant of the above command may be used. For example:
+  ```
+  $ exec ssh-agent bash
+  ```
+  or 
+  ```
+  $ exec ssh-agent zsh
+  ```
+  ```
 
 2. Add your SSH private key to the ssh-agent. {% data reusables.ssh.add-ssh-key-to-ssh-agent %}
    {% data reusables.ssh.add-ssh-key-to-ssh-agent-commandline %}