Document `/api/v2/roles/templates` #15509

Job	Run time
examples / examples	1m 49s
pre-commit / pre-commit	1m 34s
test / test (2.7, ubuntu-latest)	2m 1s
test / test (3.2, ubuntu-latest)	1m 50s
test / test (jruby-9.4.12.0, ubuntu-latest)	2m 57s
report	7s
	10m 18s

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