src: remove outdated comments in contextify #6000

Job	Run time
Build slim tarball	2m 36s
collect-openssl-versions	5s
aarch64-linux: Cache V8 build	26s
x86_64-darwin: with shared libraries	50m 28s
aarch64-darwin: with shared libraries	28m 19s
x86_64-linux: with shared libraries	30m 41s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	24m 45s
aarch64-linux: with shared openssl_4_0 (4.0.0)	26m 55s
aarch64-linux: with shared openssl_3 (3.0.19)	25m 10s
aarch64-linux: with shared openssl_3_6 (3.6.1)	25m 49s
aarch64-linux: with shared openssl_3_5 (3.5.5)	25m 54s
	4h 1m 8s

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