Trim the migration guide to genuine v1-to-v2 breaking changes #4210

Job	Run time
checks / docs	1m 33s
checks / test (3.11, lowest-direct, windows-latest)	2m 2s
checks / test (3.10, locked, windows-latest)	2m 9s
checks / test (3.14, locked, ubuntu-latest)	1m 30s
checks / test (3.11, locked, ubuntu-latest)	1m 32s
checks / test (3.14, locked, windows-latest)	2m 17s
checks / test (3.12, locked, ubuntu-latest)	1m 29s
checks / test (3.11, locked, windows-latest)	2m 10s
checks / test (3.13, lowest-direct, windows-latest)	2m 19s
checks / test (3.10, locked, ubuntu-latest)	1m 24s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.13, locked, ubuntu-latest)	1m 9s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.12, lowest-direct, windows-latest)	2m 2s
checks / pre-commit	1m 9s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.10, lowest-direct, windows-latest)	2m 7s
checks / test (3.13, locked, windows-latest)	2m 9s
checks / test (3.14, lowest-direct, windows-latest)	2m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 38s
checks / test (3.12, locked, windows-latest)	2m 20s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
all-green	3s
	38m 27s

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