[Support] Update gathering-information-for-troubleshooting-sites.mdx

[CFSeiya]

added mtr for tcp
ref: https://help.salesforce.com/s/articleView?id=001114985&type=1

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PR Change Summary

Updated troubleshooting documentation to include MTR command usage for TCP connections.

• Added MTR command example for TCP port usage
• Included reference link for analyzing MTR results

Modified Files

• src/content/docs/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites.mdx

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