[docs] [issue11373] Fix 2 new typos in the docs

[Boštjan Mejak]

Boštjan Mejak <bostjan.mejak at gmail.com> added the comment:

Please fix the word "Builtin" to "Built-in" as well. Thank you.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11373>
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