fix numerous typos of "occurred" (#287) #1112

Job	Run time
Clippy	43s
Rustfmt	7s
Test (MSRV)	1m 20s
Build docs	2m 24s
Test (stable)	1m 58s
Test (beta)	2m 11s
Test (nightly)	1m 46s
Test (macOS)	1m 30s
Test (Windows)	4m 40s
Test (no features)	1m 8s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 18s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 14s
	20m 19s

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