Add comment explaining the PYBIND11_NO_ASSERT_GIL_HELD_INCREF_DECREF #2415

Job	Run time
Prepare	1m 2s
Prepare	1m 2s
CI Pipeline / Build (amd64)	8m 42s
CI Pipeline / Build (amd64)	8m 42s
checks / other-checks	1m 4s
checks / other-checks	1m 4s
CI Pipeline / Check	9m 26s
CI Pipeline / Check	9m 26s
CI Pipeline / Build (arm64)	6m 1s
CI Pipeline / Build (arm64)	6m 1s
checks / check-style	1m 38s
checks / check-style	1m 38s
CI Pipeline / Test (amd64)	21m 51s
CI Pipeline / Test (amd64)	29m 2s
CI Pipeline / Test (arm64)	8m 22s
CI Pipeline / Test (arm64)	23m 11s
CI Pipeline / Documentation	26m 23s
CI Pipeline / Documentation	26m 23s
CI Pipeline / Conda Package	0s
pr-builder	0s
CI Pipeline / Conda Package (amd64)	33m 13s
CI Pipeline / Conda Package (arm64)	17m 58s
pr-builder / run	1s
	4h 2m 10s

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