Polish key description

Closes gh-14450

Author: snicoll

spring-boot-project/spring-boot-devtools/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -23,7 +23,7 @@
     {
       "name": "spring.devtools.add-properties",
       "type": "java.lang.Boolean",
-      "description": "Whether to enable devtool property defaults.",
+      "description": "Whether to enable development property defaults.",
       "defaultValue": true
     }
   ]

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -1491,6 +1491,7 @@ content into your application. Rather, pick only the properties that you need.
 	# ----------------------------------------
 
 	# DEVTOOLS ({sc-spring-boot-devtools}/autoconfigure/DevToolsProperties.{sc-ext}[DevToolsProperties])
+	spring.devtools.add-properties=true # Whether to enable development property defaults.
 	spring.devtools.livereload.enabled=true # Whether to enable a livereload.com-compatible server.
 	spring.devtools.livereload.port=35729 # Server port.
 	spring.devtools.restart.additional-exclude= # Additional patterns that should be excluded from triggering a full restart.