Align danger alert to match the markdown notation

[akordowski]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

Multiple articles.

What part(s) of the article would you like to see updated?

The articles

• Using GitHub Enterprise Server with a load balancer
• Cluster network configuration

are using the \data\reusables\enterprise_clustering\proxy_xff_firewall_warning.md reusable to display the following alert:

and the article

• Monitoring the health of your cluster

has the following alert:

I would suggest to use the > [!CAUTION] markdown notation to align this alerts with other alerts (also as described here).

Additional information

I could provide a PR with a fix.

[nguyenalex836]

@akordowski I'm in agreement with you 💛 Feel free to open a PR whenever you have time!