Fixup docs on ReactionRemoveEmoji gateway event #6391

Job	Run time
Check (builder without model)	1m 0s
Check (unstable + typesize)	53s
Check (temp cache)	48s
Build docs	53s
Check (unstable (no default features))	41s
Check minimal versions	55s
Test (beta)	1m 28s
Check (temp cache + typesize)	54s
Test (nightly)	1m 18s
MSRV	0s
Test (macOS)	1m 50s
Test (native-tls)	1m 11s
Test (Windows)	3m 14s
Test (stable)	1m 16s
Examples	3m 2s
Test (no gateway)	1m 4s
Test (no cache)	1m 3s
Test (chrono)	40s
Test (zlib and zstd compression)	1m 11s
Test (zstd compression)	1m 8s
Test (no default features)	43s
Test (zlib compression)	1m 10s
	26m 22s

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