Fix npm commands in DockerTests.md (facebook#21758)

Summary:
[DOCS] [BUGFIX] [DockerTests.md] - Fix npm commands after facebook#18597
Pull Request resolved: facebook#21758

Differential Revision: D10366764

Pulled By: RSNara

fbshipit-source-id: 3b6050105df9eb99e7a591c7cc4fdec2ae25be9d

Author: prog1dev

DockerTests.md

@@ -12,9 +12,9 @@ See <https://docs.docker.com/engine/installation/> for more information on how t
 
 We have added a number of default run scripts to the `package.json` file to simplify building and running your tests.
 
-`npm run test-android-setup` - Pulls down the base android docker image used for running the tests
+`npm run docker-setup-android` - Pulls down the base android docker image used for running the tests
 
-`npm run test-android-build` - Builds the docker image used to run the tests
+`npm run docker-build-android` - Builds the docker image used to run the tests
 
 `npm run test-android-run-unit` - Runs all the unit tests that have been built in the latest react/android docker image (note: you need to run test-android-build before executing this, if the image does not exist it will fail)