Update check%7Cchecking_if_a_list_of_synonyms_exists%7C3.md

Small grammar fix.
Update get%7Cretrieving_a_more-like-this_template%7C2.md

Fixed cut/paste mistake, "search templates" are now MoreLikeThis templates.
Update put_text%7Cinserting_documents_using_text_format%7C3.md

Text fixes for clarity
Update how_to_exclude_some_part_of_webpage_from_crawling.md

Clarified CSS wording.
Update how_to_use_selenium_to_crawl_websites.md

Diction/grammar fixes