[3.10] bpo-45464: [doc] Explain that subclassing multiple exceptions is fragile (GH-29094)#29104

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ambv merged 1 commit intopython:3.10from miss-islington:backport-dff0b71-3.10

Oct 20, 2021

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bpo-45464: [doc] Explain that subclassing multiple exceptions is fragile (pythonGH-29094 )

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