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

[Stéphane Wirtel]

Stéphane Wirtel added the comment:

ok, found: http://www.edufind.com/english-grammar/period-full-stop-or-point/

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25212>
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