Relative link to docs broken
Relative link to docs broken

The link to Storybook docs was relative, which on [the production site](https://storybook.js.org/docs/react/writing-docs/docs-page) links to the **next** branch, instead of the **master**.

Old link using relative:
`https://github.com/storybookjs/storybook/blob/next/addons/docs/README`

New link:
`https://github.com/storybookjs/storybook/blob/master/addons/docs/README.md`

Not sure if there's a way to use the relative link and have it point to master instead of next? But for now, hard-coded link will definitely work.
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