Clean up ignored doctests #965

Job	Run time
Test (macOS)	1m 14s
Test (stable)	2m 32s
Build docs	27s
Test (beta)	2m 34s
Examples	2m 22s
Check minimal versions	38s
Test (Windows)	4m 49s
MSRV	0s
Test (native-tls)	2m 19s
Test (no default features)	44s
Test (nightly)	1m 36s
Test (no cache)	2m 15s
Test (no gateway)	1m 35s
Test (unstable Discord API features)	2m 30s
Test (chrono, chrono)	41s
Test (unstable API + typesize, default unstable typesize, true)	1m 3s
Test (builder without model, builder, true)	20s
Test (unstable Discord API (no default features), unstable, true)	31s
	28m 10s

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