Add doc for implicit namespace packages #434

Job	Run time
Build sdist	55s
Documentation	8m 46s
Check Format	15s
Run tests [g++]	4m 7s
Build wheels on ubuntu-latest for x86_64	2m 0s
Build wheels on ubuntu-latest for x86_64	2m 8s
Build wheels on ubuntu-latest for x86_64	2m 5s
Build wheels on windows-latest for auto64	3m 52s
Build wheels on windows-latest for auto64	4m 1s
Build wheels on windows-latest for auto64	3m 39s
Build wheels on macos-12 for x86_64	2m 34s
Build wheels on macos-12 for x86_64	3m 30s
Build wheels on macos-12 for x86_64	3m 8s
Build wheels on macos-12 for arm64	3m 53s
Build wheels on macos-12 for arm64	3m 32s
Build wheels on macos-12 for arm64	3m 35s
Test sdist install	1m 31s
Publish docs versions JSON	0s
Test wheel on ubuntu-latest with Python 3.10	27s
Test wheel on ubuntu-latest with Python 3.11	25s
Test wheel on ubuntu-latest with Python 3.12	24s
Test wheel on windows-latest with Python 3.10	1m 17s
Test wheel on windows-latest with Python 3.11	1m 13s
Test wheel on windows-latest with Python 3.12	1m 2s
Test wheel on macos-12 with Python 3.10	1m 1s
Test wheel on macos-12 with Python 3.11	1m 3s
Test wheel on macos-12 with Python 3.12	55s
Test wheel on macos-14 with Python 3.10	47s
Test wheel on macos-14 with Python 3.11	26s
Test wheel on macos-14 with Python 3.12	32s
Publish to PyPI	0s
	1h 3m 3s

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