gmtime documentation improvement

[alemax-xyz]

Documentation states that gmtime is As in the C standard library, but it is actually different in at least one aspect: in c it is int tm_wday; /* day of the week, range 0 - sunday to 6 - saturday */, in luatz it is within 1 - sunday to 7 - saturday, it is clearly doing +1 in the code.

I think it is a good idea to mention the difference in the documentation, as fixing it will introduce a breaking change.

[daurnimator]

Ah good find. Would you like to send a PR to the docs?

I'd be happy using the verbage from the lua reference manual:

a table with the following fields: year, month (1–12), day (1–31), hour (0–23), min (0–59), sec (0–61), wday (weekday, 1–7, Sunday is 1), yday (day of the year, 1–366)