Update ruby.md

Author: nrios14

user/languages/ruby.md

@@ -27,8 +27,8 @@ language: ruby
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 The rest of this guide covers configuring Ruby projects on Travis CI. If you're
-new to Travis CI please read our [Tutorial](/user/tutorial/) and
-[build configuration](/user/customizing-the-build/) guides first.
+new to Travis CI, please read our [OnBoarding](/user/onboarding/) and
+[General Build configuration](/user/customizing-the-build/) guides first.
 
 ## Specifying Ruby versions and implementations