[docs] [issue25377] Mention octal format of mode argument of os.chmod

[Georg Brandl]

Georg Brandl added the comment:

A short sentence like 

Be careful when using number literals for *mode*. The conventional UNIX notation for numeric modes uses an octal base, which needs to be indicated with a ``0o`` prefix in Python.

should be a good addition here.  (I wonder why it isn't there, I seem to recall an earlier issue about this.)

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nosy: +georg.brandl

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