Update docs on default `metadataBase` value (#65428) #5113

Job	Run time
build	1m 49s
build-wasm (web)	20s
stable - x86_64-apple-darwin - node@16	47s
build-wasm (nodejs)	21s
stable - aarch64-apple-darwin - node@16	50s
stable - x86_64-pc-windows-msvc - node@16	1m 33s
stable - i686-pc-windows-msvc - node@16	1m 40s
stable - aarch64-pc-windows-msvc - node@16	1m 14s
stable - x86_64-unknown-linux-gnu - node@16	1m 10s
stable - x86_64-unknown-linux-musl - node@16	1m 29s
stable - aarch64-unknown-linux-gnu - node@16	1m 26s
stable - aarch64-unknown-linux-musl - node@16	1m 10s
Deploy examples	1m 23s
Deploy tarball	2m 16s
Upload Turbopack Bytesize metrics to Datadog	32s
Potentially publish release	0s
Release Stats	0s
	18m 0s

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