Add explicit anchor to discussion about constructor VS. setter injection
Add explicit anchor to discussion about constructor VS. setter injection

This commit adds an Asciidoc anchor to the section on different injection
styles to be able to link to the discussion as official recommendation.

Closes gh-1681

spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework