Add docstrings to `Wallet` #1103

Job	Run time
Build and test macOS x86_64 wheels (3.8)	8m 49s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 40s
Build and test macOS x86_64 wheels (3.9)	4m 38s
Build and test macOS arm64 wheels (3.8)	4m 17s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 34s
Build and test Windows wheels (3.8)	5m 17s
Build and test macOS arm64 wheels (3.9)	5m 29s
Build and test macOS x86_64 wheels (3.10)	7m 57s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 41s
Build and test Windows wheels (3.9)	6m 20s
Build and test macOS arm64 wheels (3.10)	6m 43s
Build and test macOS x86_64 wheels (3.11)	4m 36s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 41s
Build and test Windows wheels (3.10)	6m 42s
Build and test macOS arm64 wheels (3.11)	7m 20s
Build and test macOS x86_64 wheels (3.12)	8m 23s
Build and test Windows wheels (3.11)	6m 4s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 33s
Build and test macOS arm64 wheels (3.12)	5m 43s
Build and test Windows wheels (3.12)	5m 8s
	1h 51m 35s

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