Escape demonstration bytes in BleakClient docstring. #1786

Job	Run time
Build and test (ubuntu-latest, 3.8)	14s
Build and test (ubuntu-latest, 3.9)	14s
Build and test (ubuntu-latest, 3.10)	22s
Build and test (ubuntu-latest, 3.11)	18s
Build and test (ubuntu-latest, 3.12)	22s
Build and test (ubuntu-latest, 3.13-dev)	1m 16s
Build and test (windows-latest, 3.8)	42s
Build and test (windows-latest, 3.9)	1m 1s
Build and test (windows-latest, 3.10)	1m 3s
Build and test (windows-latest, 3.11)	1m 6s
Build and test (windows-latest, 3.12)	1m 15s
Build and test (windows-latest, 3.13-dev)	2m 12s
Build and test (macos-latest, 3.8)	42s
Build and test (macos-latest, 3.9)	37s
Build and test (macos-latest, 3.10)	27s
Build and test (macos-latest, 3.11)	23s
Build and test (macos-latest, 3.12)	35s
Build and test (macos-latest, 3.13-dev)	39s
	13m 28s

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