Development environment configuration file application-development.groovy not documented

### Expected Behavior

I expected application.groovy to be adequate for a development environment build, with environment blocks withing that file to distinguish code intended specifically for a build.

### Actual Behaviour

It turns out that application.groovy is ignored for a development environment build, and an application-development.groovy file is required instead. I was not able to find any documentation about this - certainly not in the Spring Security Core Plugin - Reference Documentation. I've spent an awful lot of time chasing what was going on.

### Steps To Reproduce

Using a gradle.properties file with org.gradle.jvmargs=-Dfile.encoding=UTF-8 -Xmx1024M -Dgrails.env=dev

### Environment Information

MacOS 12.7.4
grailsVersion=5.3.6
groovyVersion=3.0.11
org.grails.plugins:spring-security-core:5.3.0
jdk-17.jdk
IntelliJ IDEA 2023.2.6 (Ultimate Edition)

### Example Application

_No response_

### Version

5.3.6

Start with the Spring Security Core Plugin Reference Documentation and review the reported Grails development environment behavior for application.groovy and application-development.groovy. Document that application-development.groovy is required for a development build, including the grails.env=dev configuration, and make the expected configuration behavior clear.

Written by the indexing model from the issue text.