Document setting for allowing use of explicit modules with c++ interop #203

Job	Run time
cmake-smoke-test / Linux (nightly-main - noble)	5m 31s
Test / Linux (nightly-main - noble)	11m 7s
cmake-smoke-test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Test / Linux (nightly-main - jammy)	10m 53s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Test / Linux (nightly-main - focal)	11m 27s
Test / Windows (nightly-main - windows-2019)	25m 14s
Test / Linux (nightly-main - rhel-ubi9)	11m 14s
Test / Linux (nightly-6.2 - noble)	42s
Test / Linux (nightly-6.2 - jammy)	11m 10s
Test / Linux (nightly-6.2 - focal)	39s
Test / Linux (nightly-6.2 - rhel-ubi9)	11m 24s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	39s
Soundness / Format check	0s
Soundness / License headers check	15s
Soundness / Python lint check	9s
Soundness / Shell check	35s
Soundness / Unacceptable language check	6s
Soundness / YAML lint check	7s
	1h 41m 16s

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