[docs] [issue12704] Language Reference: Clarify behaviour of yield when generator is not resumed

[Georg Brandl]

Georg Brandl added the comment:

Hmm, the yield statement is now basically the same as any expression statement -- just like a function call.  The only reason it's a separate grammar symbol is that otherwise yield expressions would have to be parenthesized.

Can the patch be updated to make this a bit clearer?  Otherwise I like the approach of moving the info to the expressions page.

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<http://bugs.python.org/issue12704>
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