Add `print` documentation (#668) #1782

Job	Run time
check	1m 22s
fuzz record_ref	6m 37s
fuzz select_query	7m 48s
cross x86_64-unknown-linux-gnu (stable)	1m 51s
cross x86_64-unknown-linux-gnu (beta)	2m 7s
cross x86_64-unknown-linux-gnu (nightly)	1m 54s
cross x86_64-unknown-linux-musl (stable)	1m 54s
cross aarch64-unknown-linux-gnu (stable)	1m 59s
cross aarch64-unknown-linux-musl (stable)	1m 53s
test x86_64-unknown-linux-gnu (stable)	2m 5s
test x86_64-unknown-linux-gnu (beta)	2m 5s
test x86_64-unknown-linux-gnu (nightly)	2m 31s
test x86_64-apple-darwin (stable)	3m 1s
test x86_64-apple-darwin (beta)	3m 24s
test x86_64-apple-darwin (nightly)	2m 55s
test x86_64-pc-windows-gnu (stable)	4m 33s
test i686-pc-windows-msvc (stable)	5m 5s
clippy	1m 1s
deny	2m 2s
audit	1m 7s
book	3m 17s
fmt	22s
miri	1m 56s
upgrades	2m 52s
gh-pages	4m 17s
	1h 9m 58s

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