Fix documentation on `ReactionRemoveEmoji` event (#3436) #6394

Job	Run time
Check minimal versions	1m 0s
Check (builder without model)	45s
Check (unstable + typesize)	1m 10s
Check (unstable (no default features))	44s
Check (temp cache)	1m 0s
Check (temp cache + typesize)	56s
Build docs	56s
Test (native-tls)	1m 46s
Test (stable)	1m 14s
Test (macOS)	2m 7s
Examples	3m 12s
Test (Windows)	5m 21s
Test (nightly)	1m 19s
Test (zlib and zstd compression)	1m 16s
Test (beta)	1m 21s
Test (no default features)	54s
Test (zstd compression)	1m 22s
Test (no gateway)	49s
Test (chrono)	55s
Test (zlib compression)	1m 2s
Test (no cache)	1m 13s
MSRV	-1s
	30m 21s

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