README link fixes (facebook#5326)

* Fix broken link in main README

* Fix incorrect link in user guide README

Author: davidgilbertson

template/README.md

@@ -96,7 +96,7 @@ You can find the most recent version of this guide [here](https://github.com/fac
   - [S3 and CloudFront](#s3-and-cloudfront)
   - [Surge](#surge)
 - [Advanced Configuration](#advanced-configuration)
-- [Troubleshooting](#troubleshooting)
+- [Troubleshooting](#troubleshooting-1)
   - [`npm start` doesn’t detect changes](#npm-start-doesnt-detect-changes)
   - [`npm test` hangs or crashes on macOS Sierra](#npm-test-hangs-or-crashes-on-macos-sierra)
   - [`npm run build` exits too early](#npm-run-build-exits-too-early)