Update Diagnostics.md - Add a note about content logs level (#14094)
Update Diagnostics.md - Add a note about content logs level (#14094)

Co-authored-by: Heath Stewart <000adcdb538a23958a5c8a47bf9d5190b62aba33@microsoft.com>
jackmagic313/azure-sdk-for-net,ayeletshpigelman/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,brjohnstmsft/azure-sdk-for-net,markcowl/azure-sdk-for-net,brjohnstmsft/azure-sdk-for-net,ayeletshpigelman/azure-sdk-for-net,jackmagic313/azure-sdk-for-net,jackmagic313/azure-sdk-for-net,brjohnstmsft/azure-sdk-for-net,yugangw-msft/azure-sdk-for-net,yugangw-msft/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,ayeletshpigelman/azure-sdk-for-net,brjohnstmsft/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,jackmagic313/azure-sdk-for-net,ayeletshpigelman/azure-sdk-for-net,brjohnstmsft/azure-sdk-for-net,yugangw-msft/azure-sdk-for-net,jackmagic313/azure-sdk-for-net