[issue11436] Clarify struct doc for format 's', when it is mentioned without numeric prefix

[Terry J. Reedy]

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

Those others field types have a standard or system-dependent fixed size and a number is an optional repeat count. Format 's' is always a single field because number prefix for that is special -- a field size.

"For the 's' format character, the count is interpreted as the length of the bytes, not a repeat count like for the other format characters; for example, '10s' means a single 10-byte string, while '10c' means 10 characters. "

I happen to think is could use a few more words of special explanation. Looking again, I think ", which defaults to 1" after the first 'count' above, would be sufficient. We nearly always docucument defaults.

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