create_application_commands can now take any IntoIterator: not just &[] #1120

Job	Run time
Build docs	1m 29s
Rustfmt	12s
Clippy	48s
Test (MSRV)	1m 24s
Test (stable)	2m 13s
Test (beta)	2m 4s
Test (nightly)	1m 41s
Test (macOS)	1m 32s
Test (Windows)	4m 9s
Test (no features)	1m 12s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 17s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 30s
	19m 31s

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