Add note about token in GH Enterprise when running bootstrap script #378

Job	Run time
Alpine Linux	2m 7s
FreeBSD-x86_64 with rust stable	1m 40s
Linux-x86_64 with rust stable	3m 38s
Linux-x86_64 (rustls-native-roots) with rust stable	3m 9s
Linux-x86_64 (native-tls) with rust stable	3m 10s
Linux-x86_64 (native-tls-vendored) with rust stable	4m 4s
Linux-aarch64 with rust stable	2m 24s
Linux-arm with rust stable	2m 25s
Linux-i686 with rust stable	1m 56s
Linux-powerpc with rust stable	1m 58s
Linux-powerpc64 with rust stable	1m 50s
Linux-powerpc64le with rust stable	53s
Linux-riscv64 with rust stable	2m 27s
Linux-s390x with rust stable	1m 50s
NetBSD-x86_64 with rust stable	1m 55s
Windows-aarch64 with rust stable	1m 46s
Windows-i686 with rust stable	4m 47s
Windows-x86_64 with rust stable	7m 48s
macOS-x86_64 with rust stable	1m 26s
macOS-aarch64 with rust stable	2m 39s
Linux-x86_64 with rust beta	3m 10s
Linux-x86_64 with rust nightly	3m 11s
	1h 0m 13s

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