last fixes and docs

[nadobando]

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[github-actions]

File	Coverage
All files	85%	✅
indexes.py	98%	✅
utils.py	85%	✅
connection/client.py	0%	❌
connection/graph_utils.py	92%	✅
connection/query_utils.py	90%	✅
connection/session.py	79%	✅
connection/types.py	95%	✅
connection/utils.py	80%	✅
orm/encoders.py	69%	❌
orm/query.py	85%	✅
orm/utils.py	90%	✅
orm/models/base.py	87%	✅
orm/models/edge.py	88%	✅
orm/models/fields.py	95%	✅
orm/models/relations.py	64%	❌
orm/models/sentinel.py	66%	❌
orm/models/types.py	90%	✅
orm/models/vertex.py	91%	✅
query/expressions.py	83%	✅
query/functions.py	76%	✅
query/operations.py	85%	✅
query/options.py	84%	✅
query/query.py	93%	✅
query/utils.py	71%	❌

Minimum allowed coverage is 75%

Generated by 🐒 cobertura-action against a4812b6