docs: Explain the purpose of `updateId` (#1318) #3657

Job	Run time
build-docs	11m 38s
build-and-test (true, 14, ubuntu-latest)	6h 0m 15s
compile-binaries (buildjet-2vcpu-ubuntu-1804, x86_64-unknown-linux-gnu)	6m 5s
build-and-test (true, 14, macos-latest)	15m 34s
lint-and-prune	2m 27s
build-and-test (true, 14, windows-latest)	11m 29s
compile-binaries (buildjet-2vcpu-ubuntu-1804, aarch64-unknown-linux-gnu, -C linker=aarch64-linux-...	3m 43s
build-and-test (true, 16, ubuntu-latest)	8m 11s
compile-binaries (macos-latest, x86_64-apple-darwin)	9m 41s
build-and-test (true, 16, macos-latest)	16m 29s
compile-binaries (macos-latest, aarch64-apple-darwin)	18m 44s
build-and-test (true, 16, windows-latest)	12m 24s
compile-binaries (windows-latest, x86_64-pc-windows-msvc)	9m 48s
build-and-test (true, 18, ubuntu-latest)	8m 39s
build-and-test (true, 18, macos-latest)	6h 0m 15s
build-and-test (true, 18, windows-latest)	11m 53s
build-and-test (true, 20, ubuntu-latest)	6h 0m 16s
build-and-test (true, 20, macos-latest)	6h 0m 14s
build-and-test (true, 20, windows-latest)	12m 38s
build-and-test (ubuntu-latest, 20, false)	6h 0m 16s
features-tests / test	5m 30s
stress-tests / stress-test	13m 39s
stress-tests-reuse-context / stress-test	6m 29s
test-npm-init (ubuntu-latest, x86_64-unknown-linux-gnu, 20, local, hello-world)	1m 36s
test-npm-init (ubuntu-latest, x86_64-unknown-linux-gnu, 20, local, fetch-esm)	1m 40s
test-npm-init (macos-latest, x86_64-apple-darwin, 20, cloud, hello-world-mtls)	1m 40s
test-npm-init (windows-latest, x86_64-pc-windows-msvc, 20, cloud, hello-world-mtls)	3m 20s
	1d 9h 14m 33s

Provide feedback