Summary:
Searched for broken link patterns inside the app itself. I think I found them all but it's not certain.
Patterns searched for and replaced:
```
.html
getting-started/)
getting-started)
getting-started"
```
and also searched the repo for regex `\]\(.*)` and checked them by eye.
Reviewed By: passy
Differential Revision: D21306944
fbshipit-source-id: a2e09b0fd8677f5f26e5cc4a06805b474247f7e6
b27f8ee236