Fix section links to not include .html suffix

Closes gh-33206

Author: mhalbritter

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features.adoc

@@ -6,7 +6,7 @@ include::attributes.adoc[]
 
 This section dives into the details of Spring Boot.
 Here you can learn about the key features that you may want to use and customize.
-If you have not already done so, you might want to read the "<<getting-started#getting-started>>" and "<<using#using>>" sections, so that you have a good grounding of the basics.
+If you have not already done so, you might want to read the "<<getting-started#getting-started, Getting Started>>" and "<<using#using, Developing with Spring Boot>>" sections, so that you have a good grounding of the basics.