Update contacting-cloudflare-support.mdx

[travisgahn]

Added 2 extra steps required to view all cases

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[haleycode]

@travisgahn Approved with a minor stylistic change.

[travisgahn]

looks good!

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