[docs] [issue25212] Remove the double spaces in the C-API Intro

[Georg Brandl]

Georg Brandl added the comment:

> As a french, I was always distributed by this, but it's correct in english :-)

You know what you have to tell LaTeX to not put extra space after all full stops? \frenchspacing :)

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nosy: +georg.brandl

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<http://bugs.python.org/issue25212>
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