docs: Expand v3 upgrade guide to cover all breaking changes (#698) #116

Job	Run time
Docstrings checks / Docstrings checks	12s
Code checks / Actions lint check	31s
Code checks / Spell check	4s
Doc checks / Doc checks / Docs check	1m 9s
Code checks / Lint check / Lint check (3.11)	11s
Code checks / Type check / Type check (3.12)	11s
Code checks / Lint check / Lint check (3.13)	9s
Code checks / Type check / Type check (3.14)	9s
Code checks / Lint check / Lint check (3.14)	13s
Code checks / Type check / Type check (3.13)	13s
Code checks / Lint check / Lint check (3.12)	14s
Code checks / Type check / Type check (3.11)	8s
Tests	0s
Release prepare	0s
PyPI publish	0s
Changelog update	0s
Doc release post publish	0s
Doc release / Doc release	1m 14s
	4m 38s

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