[issue25381] Doc: Use of old description of raise in Python3

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

On 2007 Aug 15, extending.rst was merged into master (early 2.6 alpha)  and early 3.0 alpha.  The only change to this paragraph since the initial 2.6 version was Serhiy changing "*NULL*" to "``NULL``" in 3.x on 2019 Oct 30.  I will post a PR with what I think is true now.

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nosy: +iritkatriel
versions: +Python 3.10, Python 3.9

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