[docs] [issue27387] Thread hangs on str.encode() when locale is not set

[STINNER Victor]

STINNER Victor added the comment:

> Maybe it is worth adding a warning to that section of the 2.7 docs about implicit imports in general and encode/decode in particular?

Ok to add a note to str.encode and str.decode methods to explain that
an import is needed the first time that an encoding is used.

I'm not ok for a warning, we should not discourage developers to use
these methods! They are not dangerous by themself.

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