docs: docstrings for schema version classes

[jkowalleck]

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📚 CycloneDX Python Library | 🛠️ Build #31791243 | 📁 Comparing c1e6148 against latest (44f1273)

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Coverage variation	Diff coverage
✅ +0.00%	✅ 100.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (44f1273)	5908	5561	94.13%
Head commit (c1e6148)	5908 (+0)	5561 (+0)	94.13% (+0.00%)

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	Coverable lines	Covered lines	Diff coverage
Pull request (#946)	1	1	100.00%

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