[docs] backslash ending raw string literals.

[Georg Brandl]

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Am 26.08.2013 23:59, schrieb Scot Kelly:
> From the doc: http://docs.python.org/2/reference/lexical_analysis.html
> 
> r"\"is not a valid string literal (even a raw string cannot end in an odd 
> number of backslashes). Specifically, //a raw string cannot end in a
> single backslash// (since the backslash would escape the following quote
> character).
> 
> 
> 
> If it?s a raw string, then the backslash will _not_escape the following
> quote character.  Ergo r?\? should be allowed.

Hi Scot,

this is due to a limitation of the Python lexer; the inconsistency is minor
and is accepted as the lesser evil and documented.

cheers,
Georg
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