Make it obvious how easy it is to improve the docs

[johnnyreilly]

Because it's very easy indeed!

[bebraw]

The new docs will have an "edit" button as well. Instead of going through wiki, we'll be going through PRs at least at the beginning to keep it controlled.

[SpaceK33z]

Agree, issues like webpack/webpack-dev-server#553 constantly appear in all package repo's.

[SpaceK33z]

Closing since the new docs have an "edit" button now (don't know when that got implemented).