Enable Section Summary TOC for small pages

docs/modules/modules/ROOT/pages/README.adoc

@@ -1,10 +1,12 @@
 
 [[building]]
 = Building
+:page-section-summary-toc: 1
 
 include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/main/docs/src/main/asciidoc/building.adoc[]
 
 [[contributing]]
 = Contributing
+:page-section-summary-toc: 1
 
 include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/main/docs/src/main/asciidoc/contributing.adoc[]

docs/modules/modules/ROOT/pages/_observability.adoc

@@ -2,6 +2,7 @@
 
 [[observability]]
 = Observability metadata
+:page-section-summary-toc: 1
 
 include::{root-target}_metrics.adoc[]
 

docs/modules/modules/ROOT/pages/appendix.adoc

@@ -2,6 +2,7 @@
 [appendix]
 [[common-application-properties]]
 = Common application properties
+:page-section-summary-toc: 1
 
 
 Various properties can be specified inside your `application.properties` file, inside your `application.yml` file, or as command line switches.

docs/modules/modules/ROOT/pages/spring-cloud-commons.adoc

@@ -1,5 +1,6 @@
 [[cloud-native-applications]]
 = Cloud Native Applications
+:page-section-summary-toc: 1
 
 
 // TODO: figure out remote includes in docs and replace pasted text

docs/modules/modules/ROOT/pages/spring-cloud-commons/cachedrandompropertysource.adoc

@@ -1,5 +1,6 @@
 [[cachedrandompropertysource]]
 = CachedRandomPropertySource
+:page-section-summary-toc: 1
 
 Spring Cloud Context provides a `PropertySource` that caches random values based on a key.  Outside of the caching
 functionality it works the same as Spring Boot's https://github.com/spring-projects/spring-boot/blob/main/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/RandomValuePropertySource.java[`RandomValuePropertySource`].

docs/modules/modules/ROOT/pages/spring-cloud-commons/circuit-breaker.adoc

@@ -1,5 +1,6 @@
 [[spring-cloud-circuit-breaker]]
 = Spring Cloud Circuit Breaker
+:page-section-summary-toc: 1
 
 include:../:spring-cloud-circuitbreaker.adoc[leveloffset=+1]
 

docs/modules/modules/ROOT/pages/spring-cloud-commons/configuration-properties.adoc

@@ -1,4 +1,5 @@
 [[configuration-properties]]
 = Configuration Properties
+:page-section-summary-toc: 1
 
 To see the list of all Spring Cloud Commons related configuration properties please check link:appendix.html[the Appendix page].