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bpo-23188: Document that PyErr_SetString, etc. chains exceptions

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Original file line number	Diff line number	Diff line change
`@@ -92,7 +92,10 @@ Raising exceptions`
`92`	`92`
`93`	`93`	`These functions help you set the current thread's error indicator.`
`94`	`94`	`For convenience, some of these functions will always return a`
`95`		-``NULL`` pointer for use in a ``return`` statement.
	`95`	+``NULL`` pointer for use in a ``return`` statement. Also, for all of the
	`96`	`+functions in this subsection, if an exception has already been caught,`
	`97`	`+that exception will be implicitly chained (i.e. the last caught exception`
	`98`	+will become the new exception's:attr:`__context__`).
`96`	`99`
`97`	`100`
`98`	`101`	`.. c:function:: void PyErr_SetString(PyObject type, const char message)`

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`@@ -0,0 +1,2 @@`
	`1`	+Mention that:c:func:`PyErr_SetString`,:c:func:`PyErr_SetObject`, and
	`2`	`+friends implicitly chain exceptions.`

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