Tutorial.rst: Modify example
Tutorial.rst: Modify example

Change in command to show that `--show-bears
--filter-by-language` can accept multiple
languages as arguments.

Closes https://github.com/coala/documentation/issues/34

coala/documentation,rhemon/documentation,Warewolf96/documentation,AnishHota/documentation,kshitijkg01/documentation,Asnelchristian/documentation,coala/documentation,coala/documentation