DASHON-124 Updating instructions for Support portal navigation

[simon-says]

Summary

The dashboard support menu has changed name / location - this updates the instructions and the screenshot

Documentation checklist

• [ x ] The documentation style guide has been adhered to.

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PR Change Summary

Updated instructions for navigating the Support portal due to changes in the dashboard support menu.

• Changed the name and location of the Support menu in the dashboard instructions.
• Updated links to the Support portal for better accessibility.
• Revised steps for viewing open support cases and adding participants to tickets.

Modified Files

• src/content/docs/support/contacting-cloudflare-support.mdx

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