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bpo-33201: Modernize "Extension types" doc (GH-6337)

* bpo-33201: Modernize "Extension types" doc
* Split tutorial and other topics
* Some small fixes
* Address some review comments
* Rename noddy* to custom* and shoddy to sublist
* Fix markup
A
Antoine Pitrou committed
1d80a561734b9932961c546b0897405a3bfbf3e6
Parent: b405752
Committed by GitHub <noreply@github.com> on 4/7/2018, 4:14:03 PM