Fixed doc rendering

docs/src/main/asciidoc/README.adoc

@@ -2,7 +2,7 @@ image::https://travis-ci.org/spring-cloud/spring-cloud-function.svg?branch=maste
 
 == Introduction
 
-include::intro.adoc[]
+include::_intro.adoc[]
 
 == Getting Started
 

docs/src/main/asciidoc/adapters/aws-readme.adoc

@@ -1,3 +1,3 @@
 This project provides an adapter layer for a Spring Cloud Function application onto AWS Lambda. You can write an app with a single `@Bean` of type `Function`, `Consumer` or `Supplier` and it will be deployable in AWS if you get the JAR file laid out right. The best way to make it work is to include `spring-cloud-function-context` as a dependency, but not the higher level adapters (e.g. `spring-cloud-function-stream`).
 
-include::adapters/aws-intro.adoc[]
+include::./adapters/aws-intro.adoc[]

docs/src/main/asciidoc/adapters/azure-readme.adoc

@@ -1,7 +1,7 @@
 This project provides an adapter layer for a Spring Cloud Function application onto Azure.
 You can write an app with a single `@Bean` of type `Function` and it will be deployable in Azure if you get the JAR file laid out right.
 
-include::adapters/azure-intro.adoc[]
+include::./adapters/azure-intro.adoc[]
 
 == Sample Function
 

docs/src/main/asciidoc/adapters/openwhisk-readme.adoc

@@ -1,6 +1,6 @@
 == Quick Start
 
-include::adapters/openwhisk-quick-start.adoc[]
+include::./adapters/openwhisk-quick-start.adoc[]
 
 == Examples
 

docs/src/main/asciidoc/spring-cloud-function.adoc

@@ -16,7 +16,7 @@ Mark Fisher, Dave Syer, Oleg Zhurakousky, Anshul Mehra
 
 == Introduction
 
-include::intro.adoc[]
+include::_intro.adoc[]
 
 include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/docs/src/main/asciidoc/contributing-docs.adoc[]