[docs] [issue35714] Document that the null character '\0' terminates a struct format spec

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I think the null character is illegal character in the format string, and struct functions should raise a struct.error for it.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue35714>
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