Remove Markdown explanations, after figuring out how to handle links

[Jef van Schendel]

Currently some inputs such as the comment field, the profile bio and the media description have "You can use Markdown for formatting." next to them, where "Markdown" links to ​http://daringfireball.net/projects/markdown/basics .

I'd prefer to have these removed, the reasons being:

1. Not all Markdown styles work, on purpose. Headers don't show, for instance, because this would mess up the page layout.
2. Markdown aims to be as natural as possibe. Type *this* and it will show it with emphasis. Lists are easy to create as well. Therefore, no explicit explanation is needed.
3. Having less stuff is good.

The only problem to me seems to be links, because it is unclear how to create those. Either:

1. We explain how to create links.
2. We add a small button that inserts a link template in the field.

Otherwise, it will be hard to figure out how to create links because inserting a URL will not result in one (maybe that is a bug in itself?).