add short titles to frontmatter (#20131)

content/github/authenticating-to-github/troubleshooting-ssh/deleted-or-missing-ssh-keys.md

@@ -8,6 +8,7 @@ versions:
   fpt: '*'
 topics:
   - SSH
+shortTitle: Deleted or missing SSH keys
 ---
 {% data variables.product.prodname_dotcom %} automatically deletes inactive SSH keys to help keep accounts safe, such as after someone leaves a job or loses a computer.
 

content/github/authenticating-to-github/troubleshooting-ssh/error-agent-admitted-failure-to-sign.md

@@ -11,6 +11,7 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: Agent failure to sign
 ---
 When trying to SSH into {% data variables.product.product_location %} on a Linux computer, you may see the following message in your terminal:
 

content/github/authenticating-to-github/troubleshooting-ssh/error-permission-denied-publickey.md

@@ -10,6 +10,7 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: Permission denied (publickey)
 ---
 ## Should the `sudo` command be used with Git?
 

content/github/authenticating-to-github/troubleshooting-ssh/error-permission-to-userrepo-denied-to-other-user.md

@@ -11,5 +11,6 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: Permission denied other-user
 ---
 To fix this, the owner of the repository (`user`) needs to add your account (`other-user`) as a collaborator on the repository or to a team that has write access to the repository.

content/github/authenticating-to-github/troubleshooting-ssh/error-permission-to-userrepo-denied-to-userother-repo.md

@@ -11,6 +11,7 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: Permission denied other-repo
 ---
 To fix this, remove the deploy key from the repository, and [add the key to your user account](/articles/adding-a-new-ssh-key-to-your-github-account) instead.
 

content/github/authenticating-to-github/troubleshooting-ssh/error-ssh-add-illegal-option----k.md

@@ -11,6 +11,7 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: 'ssh-add: illegal option -- K'
 ---
 The `-K` option is in Apple's standard version of `ssh-add`, which stores the passphrase in your keychain for you when you add an ssh key to the ssh-agent. If you have installed a different version of `ssh-add`, it may lack support for `-K`.
 

content/github/authenticating-to-github/troubleshooting-ssh/error-ssl-certificate-problem-verify-that-the-ca-cert-is-ok.md

@@ -8,6 +8,7 @@ versions:
   fpt: '*'
 topics:
   - SSH
+shortTitle: SSL certificate problem
 ---
 The error you receive may look like the following:
 

content/github/authenticating-to-github/troubleshooting-ssh/error-were-doing-an-ssh-key-audit.md

@@ -11,6 +11,7 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: SSH key audit
 ---
 When using an unverified key to perform Git operations, you will be prompted to perform an audit of your SSH keys.
 

content/github/authenticating-to-github/troubleshooting-ssh/recovering-your-ssh-key-passphrase.md

@@ -12,6 +12,7 @@ versions:
   ghae: '*'
 topics:
   - SSH
+shortTitle: Recover SSH key passphrase
 ---
 {% mac %}
 

content/github/authenticating-to-github/troubleshooting-ssh/using-ssh-over-the-https-port.md

@@ -8,6 +8,7 @@ versions:
   fpt: '*'
 topics:
   - SSH
+shortTitle: Use SSH over HTTPS port
 ---
 {% tip %}