getting-started-rails.asciidoc in elastic-apm-3.1.0

- old
+ new

@@ -3,13 +3,13 @@
 please view this documentation at
 https://www.elastic.co/guide/en/apm/agent/ruby/current/introduction.html[elastic.co]
 endif::[]
 
 [[getting-started-rails]]
-== Getting started with Rails
+=== Getting started with Rails
 
 [float]
-=== Setup
+==== Setup
 
 Add the gem to your `Gemfile`:
 
 [source,ruby]
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