Enable Section Summary TOC for small pages

docs/modules/ROOT/pages/spring-cloud-function/functional-bean-definitions.adoc

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 [[functional-bean-definitions]]
 = Functional Bean Definitions
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 include:../:functional.adoc[leveloffset=+1]
 

docs/modules/ROOT/pages/spring-cloud-function/getting-started.adoc

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 [[getting-started]]
 = Getting Started
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 include:../:getting-started.adoc[]
 

docs/modules/ROOT/pages/spring-cloud-function/introduction.adoc

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 [[introduction]]
 = Introduction
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 include:../:_intro.adoc[]
 

docs/modules/ROOT/pages/spring-cloud-function/serverless-platform-adapters.adoc

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 [[serverless-platform-adapters]]
 = Serverless Platform Adapters
+:page-section-summary-toc: 1
 
 As well as being able to run as a standalone process, a Spring Cloud
 Function application can be adapted to run one of the existing

docs/modules/ROOT/pages/spring-cloud-function/standalone-streaming-applications.adoc

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 [[standalone-streaming-applications]]
 = Standalone Streaming Applications
+:page-section-summary-toc: 1
 
 To send or receive messages from a broker (such as RabbitMQ or Kafka) you can leverage `spring-cloud-stream` project and it's integration with Spring Cloud Function.
 Please refer to https://cloud.spring.io/spring-cloud-static/spring-cloud-stream/current/reference/html/spring-cloud-stream.html#spring_cloud_function[Spring Cloud Function] section of the https://spring.io/projects/spring-cloud-stream[Spring Cloud Stream] reference manual for more details and examples.