More typos in the lessons

[Alex Gontmakher <gsasha@cs.technion.ac.il>]

Lesson 6:
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 (6.6.11):

mi cu cliva [zo'e] [zo'e] [zo'e] [zo'e]
There are too many zo'e. Also, quoted sumti for "cliva" in English
translation are wrong: there is no "means of locomotion" according to
LogFlash

Lesson 9:
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mi cu na nelci le kruji ku .i .....
Sentence is repeated twice here.