Link for Russian FAQ dataset is broken

Created by: bespaloff

Link for the dataset in documentation to train FAQ bot in Russian is broken: Origin in docs: https://github.com/deepmipt/DeepPavlov/blob/master/docs/features/skills/faq.rst Broken Link: http://www.ftl.name/page/989

As well as following links for files: http://files.deeppavlov.ai/faq/school/faq_tfidf_cos_model.pkl