[docs] [issue25689] ftplib docs language fix

[Martin Panter]

Martin Panter added the comment:

Thanks for the patch, I will commit it.

I also noticed the same problem in nntplib. And I think the sentence works even better starting as “The FTP class supports . . .”.

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nosy: +martin.panter

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<http://bugs.python.org/issue25689>
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