Update link for "work-behind-a-proxy" MS doc due to doc change

[cnotin]

Related command None in particular

Description This current link is dead: https://docs.microsoft.com/cli/azure/use-cli-effectively#work-behind-a-proxy. It redirects to https://learn.microsoft.com/en-us/cli/azure/use-azure-cli-successfully-tips but the #work-behind-a-proxy heading is missing Thanks to this diff in this file: https://github.com/MicrosoftDocs/azure-docs-cli/commit/a13273197419083910e2ccfa970ec4f3dd41b6e9#diff-4e1076161d25f82116cf0ef7a0b33a48b4883bf6c38db8f858cd1cf291655dab, I found that the new location for this content is now https://learn.microsoft.com/en-us/cli/azure/use-azure-cli-successfully-troubleshooting#error-sslerror-bad-handshakecertificate-verify-failed-proxy-blocks-connection so I've updated all references in this repo

Testing Guide I didn't test

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change [Component Name 2] az command b: Add some customer-facing feature

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