Update orgpapers.org

[lrcg]

Minor typos and remove redundant paragraph (repeated in next section)

[Altmic]

This is a very interesting tutorial and I like it very much. Especially for people with no experience in emacs and org-mode it's amazing. Also zhe contents of the book is extremely important. The link: https://github.com/vikasrawal/orgpaper/blob/master/essential-emacs-commands seems to be dead

Michael