message: Add instructions to run local documentation webserver.
diff: @@ -119,5 +119,6 @@ Use these instructions to update dependencies and devDependencies on external pa
  1. Build TypeDoc documentation for all packages: `rush docs`
  2. Build TypeDoc documentation for a single package: `cd core\backend` and then `npm run docs`
  +3. Build and run local TypeDoc documentation server: `npm run buildDocSite`
  The full list of npm scripts can be found in the root `package.json` file.
  