Substitue jira_server for jira-server (#5944)

In order to match the code:
https://github.com/getsentry/sentry/blob/a94d5af633853f6682c01667b33d9151f1a0882e/src/sentry/web/urls.py#L759

Author: armenzg

src/docs/product/integrations/issue-tracking/jira/index.mdx

@@ -55,7 +55,7 @@ openssl x509 -pubkey -noout -in jira_publickey.cer  > jira_publickey.pem
 
 1. In Jira, click the gear icon, then **Applications > Application Links**.
 1. Enter the following as the application URL:
-   `https://sentry.io/extensions/jira_server/setup/`
+   `https://sentry.io/extensions/jira-server/setup/`
 1. Click "Create New Link". If you see a warning that “No response was received from the URL you entered,” ignore and click "Continue".
 1. In the resulting dialog, fill out the form as follows:
 
@@ -79,7 +79,7 @@ openssl x509 -pubkey -noout -in jira_publickey.cer  > jira_publickey.pem
    <tr><th>Consumer Key                </th><td>(the consumer key from Step II.4)       </td></tr>
    <tr><th>Consumer Name                  </th><td>Sentry</td></tr>
    <tr><th>Public Key</th><td>(the public key you created in Section I)</td></tr>
-   <tr><th>Consumer Callback URL                      </th><td>https://sentry.io/extensions/jira_server/setup/</td></tr>
+   <tr><th>Consumer Callback URL                      </th><td>https://sentry.io/extensions/jira-server/setup/</td></tr>
    <tr><th>Allow 2-Legged OAuth                    </th><td>no</td></tr>
    </table>