docs: add transport security troubleshooting guide #3272

Job	Run time
checks / docs	40s
checks / readme-snippets	15s
checks / pre-commit	55s
checks / test (3.13, locked, windows-latest)	1m 53s
checks / test (3.11, lowest-direct, windows-latest)	2m 3s
checks / test (3.10, locked, windows-latest)	1m 53s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.10, lowest-direct, windows-latest)	1m 45s
checks / test (3.12, locked, windows-latest)	1m 43s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.12, lowest-direct, windows-latest)	1m 39s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.10, locked, ubuntu-latest)	1m 22s
checks / test (3.11, locked, windows-latest)	1m 52s
checks / test (3.11, locked, ubuntu-latest)	1m 16s
checks / test (3.12, locked, ubuntu-latest)	1m 27s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.14, lowest-direct, windows-latest)	1m 27s
checks / test (3.14, locked, windows-latest)	3m 13s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, locked, ubuntu-latest)	2m 14s
checks / test (3.13, lowest-direct, windows-latest)	1m 53s
checks / test (3.13, locked, ubuntu-latest)	1m 2s
all-green	5s
	35m 24s

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