[docs] [issue17799] settrace docs are wrong about "c_call" events

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

The reason not to pass C calls to the tracing function is that tracing exists to support pdb and other debuggers, and pdb only cares about tracing through Python code. So the docs should be updated.

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nosy: +gvanrossum

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