Specify ssh shell is required to enable dependency graph (#538)

* specify ssh shell

Specify that the command should be run within the administrative SSH shell, and link to the relevant document for access.

* Link to SSH doc as a note

* note syntrax

* remove extra space

* Update content/admin/configuration/enabling-alerts-for-vulnerable-dependencies-on-github-enterprise-server.md

Co-authored-by: hubwriter <54933897+hubwriter@users.noreply.github.com>

* Update enabling-alerts-for-vulnerable-dependencies-on-github-enterprise-server.md

* Update enabling-alerts-for-vulnerable-dependencies-on-github-enterprise-server.md

* Indenting note box in markdown.

I should have spotted this in my previous review, so I'm going to go ahead and apply this change.

Co-authored-by: hubwriter <54933897+hubwriter@users.noreply.github.com>

Author: djdefi

content/admin/configuration/enabling-alerts-for-vulnerable-dependencies-on-github-enterprise-server.md

@@ -45,6 +45,12 @@ Before enabling {% if currentVersion ver_gt "enterprise-server@2.21" %}{% data v
  ``` shell
 $ ghe-dep-graph-enable
 ```
+   {% note %}
+
+   **Note**: For more information about enabling access to the administrative shell via SSH, see "[Accessing the administrative shell (SSH)](/enterprise/{{ currentVersion }}/admin/configuration/accessing-the-administrative-shell-ssh)."
+
+   {% endnote %}
+
 3. Return to {% data variables.product.prodname_ghe_server %}.
 {% data reusables.enterprise_site_admin_settings.access-settings %}
 {% data reusables.enterprise_site_admin_settings.business %}