Bad comment header in dash-docs.el.

[marczz]

The first lines of the comment header of dash-docs.el., is a paste of the one of helm-dash.el. So it gives as url http://github.com/areina/helm-dash instead of https://github.com/dash-docs-el/dash-docs. And the wrong url is also used in melpa, so when you want some info about the package you are redirected to helm-dash. Please correct this url. (I am to lazy to make a pull request for this tiny detail.)

[pataquets]

See #201