Fix link

Summary:
Thanks for submitting a pull request! Please provide enough information so that others can review your pull request:

(You can skip this if you're fixing a typo or adding an app to the Showcase.)

Explain the **motivation** for making this change. What existing problem does the pull request solve?

Prefer **small pull requests**. These are much easier to review and more likely to get merged. Make sure the PR does only one thing, otherwise please split it.

**Test plan (required)**

Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes UI.

Make sure tests pass on both Travis and Circle CI.

**Code formatting**

Look around. Match the style of the rest of the codebase. See also the simple [style guide](https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md#style-guide).

For more info, see the ["Pull Requests" section of our "Contributing" guidelines](https://github.com/facebook/react-native/blob/mas
Closes facebook#8606

Differential Revision: D3522490

Pulled By: JoelMarcey

fbshipit-source-id: ee9eb7114b5e952a4a70a6eda39edc45445223e9

blog/2016-07-06-toward-better-documentation.md

@@ -59,6 +59,6 @@ Your feedback lets us know what we should prioritize. I know some people will re
 
 If you find a mistake in the documentation, like inaccurate descriptions or code that doesn't actually work, [file an issue](https://github.com/facebook/react-native/issues). Tag it with "Documentation", so that it's easier to route it to the right people.
 
-If there isn't a specific mistake, but something in the documentation is fundamentally confusing, it's not a great fit for a GitHub issue. Instead, complain on [Product Pains](https://productpains.com/react-native/) about the area of the docs that could use help. This helps us prioritize when we are doing more general work like guide-writing.
+If there isn't a specific mistake, but something in the documentation is fundamentally confusing, it's not a great fit for a GitHub issue. Instead, complain on [Product Pains](https://productpains.com/product/react-native/) about the area of the docs that could use help. This helps us prioritize when we are doing more general work like guide-writing.
 
 Thanks for reading this far, and thanks for using React Native!