Readd documentation on how to generate pregenerated certs

This accidentally got removed in afd4200.
web-platform-tests · Oct 14, 2019 · 186d18f · 186d18f
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diff --git a/tools/certs/README.md b/tools/certs/README.md
@@ -74,3 +74,8 @@ the path to the OpenSSL config file (typically this will be
   },
 }
 ```
+
+### Regenerating the pregenerated certificates
+
+From the root, run `./wpt serve --config tools/certs/config.json` and terminate
+it after it has started up.