[docs] [issue26029] Broken sentence in extending documentation

[Zachary Ware]

Zachary Ware added the comment:

Terry, it doesn't look like you used Upendra's patch.  What you committed just removes the "of", but doesn't change "addition" to "additional", which is also required to make that sentence make sense.

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nosy: +zach.ware

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<http://bugs.python.org/issue26029>
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