docs: add clone docs for strategy (closes #520) #1111

Job	Run time
clippy-codegen	30s
format	23s
clippy (async-std-surf)	1m 5s
test (async-std-surf)	1m 19s
clippy (tokio-hyper)	1m 4s
verify-codegen	57s
test (tokio-hyper)	1m 25s
clippy (tokio-hyper-rustls)	1m 5s
test (tokio-hyper-rustls)	1m 26s
clippy (tokio-hyper-rustls-webpki)	1m 4s
test (tokio-hyper-rustls-webpki)	1m 12s
clippy (blocking)	1m 2s
clippy (blocking-rustls)	1m 5s
clippy (blocking-rustls-webpki)	1m 4s
test (blocking)	1m 24s
test (blocking-rustls)	1m 24s
test (blocking-rustls-webpki)	1m 14s
	18m 43s

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