Add missing descriptions to v1 spec schemas and properties #17408

Job	Run time
pre-commit / pre-commit	1m 0s
examples / examples	2m 31s
test / test (2.7, ubuntu-latest)	2m 50s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 23s
test / test (3.2, ubuntu-latest)	2m 26s
report	7s
	12m 17s

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