[docs] [issue26535] Minor typo in the docs for struct.unpack

[Antony Lee]

Antony Lee added the comment:

I think mentioning calcsize is still helpful, so perhaps something like
"The buffer must contain exactly as many bytes (I think this is clearer than "the amount of data") as required by the format (this number can be obtained as `struct.calcsize(fmt)`)"?  (and likewise for "unpack_from" and "iter_unpack").

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<http://bugs.python.org/issue26535>
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