ssh: polish docs around types #18914

Job	Run time
Build Erlang/OTP (64-bit)	4m 51s
Event File	3s
Build Erlang/OTP (iOS)	4m 1s
Build Erlang/OTP (Types and Flavors)	7m 14s
Build Erlang/OTP (32-bit)	10m 4s
Build Erlang/OTP (macOS)	3m 3s
Build Erlang/OTP (cross-compile)	15m 38s
Build Erlang/OTP (Windows)	19m 8s
Build Erlang/OTP (clang)	5m 31s
Build and check documentation	5m 1s
Run static analysis	6m 16s
Test Erlang/OTP (ssh)	18m 1s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	7m 13s
	1h 46m 4s

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