Merge pull request #40135 from nahidshahin

* pr/40135:
  Polish "Ensure Reference Guides breadcrumb in page headers is hyperlinked"
  Ensure Reference Guides breadcrumb in page headers is hyperlinked

Closes gh-40135

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/index.adoc

@@ -0,0 +1,3 @@
+= Reference Guides
+
+This section provides information on using the feature and capabilities of Spring Boot.

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/partials/nav-reference.adoc

@@ -1,5 +1,4 @@
-* Reference Guides
-
+* xref:reference:index.adoc[]
 ** xref:reference:using/index.adoc[]
 *** xref:reference:using/build-systems.adoc[]
 *** xref:reference:using/structuring-your-code.adoc[]