Insert explicit ids for headers

spring-graphql-docs/modules/ROOT/pages/attributes.adoc

@@ -23,4 +23,4 @@
 :javadoc: 						https://docs.spring.io/spring-graphql/docs/{spring-graphql-version}/api
 // version attributes from main build.gradle
 :spring-framework-ref-docs: 	https://docs.spring.io/spring-framework/reference
-:spring-boot-ref-docs: 			https://docs.spring.io/spring-boot/docs/{spring-boot-version}/reference/html
+:spring-boot-ref-docs: 			https://docs.spring.io/spring-boot/docs/{spring-boot-version}/reference/html

spring-graphql-docs/modules/ROOT/pages/includes/controllers.adoc

@@ -753,4 +753,4 @@ Supported return types are listed below:
 | `Mono<T>`
 | For asynchronous resolution where `<T>` is one of the supported, synchronous, return types.
 
-|===
+|===

spring-graphql-docs/modules/ROOT/pages/includes/data.adoc

@@ -479,4 +479,4 @@ Jackson library is on the classpath, customizations like the above are applied f
 Spring for GraphQL defines a `SortStrategy` to create `Sort` from GraphQL arguments.
 `AbstractSortStrategy` implements the contract with abstract methods to extract the sort
 direction and properties. To enable support for `Sort` as a controller method argument,
-you need to declare a `SortStrategy` bean.
+you need to declare a `SortStrategy` bean.

spring-graphql-docs/modules/ROOT/pages/includes/graphiql.adoc

@@ -35,4 +35,4 @@ include::code:GraphiQlConfiguration[]
 <3> Finally, map the handler to a specific HTTP endpoint
 <4> Expose this new route through a `RouterFunction` bean
 
-You might also need to configure your application to {spring-boot-ref-docs}/web.html#web.servlet.spring-mvc.static-content[serve the relevant static resources].
+You might also need to configure your application to {spring-boot-ref-docs}/web.html#web.servlet.spring-mvc.static-content[serve the relevant static resources].

spring-graphql-docs/modules/ROOT/pages/includes/transports.adoc

@@ -161,4 +161,4 @@ by the <<boot-starter>>, see
 
 Similar to <<server.interception.web>>, an `RSocketQlInterceptor` allows intercepting
 GraphQL over RSocket requests before and after GraphQL Java engine execution. You can use
-this to customize the `graphql.ExecutionInput` and the `graphql.ExecutionResult`.
+this to customize the `graphql.ExecutionInput` and the `graphql.ExecutionResult`.

spring-graphql-docs/modules/ROOT/pages/index.adoc

@@ -1,3 +1,4 @@
+[[spring-for-graphql-documentation]]
 = Spring for GraphQL Documentation
 Brian Clozel; Andreas Marek; Rossen Stoyanchev; Mark Paluch
 include::attributes.adoc[]