Update configuration metadata for show-banner and banner-mode changes

Closes gh-4001

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

@@ -43,7 +43,7 @@ content into your application; rather pick only the properties that you need.
 	spring.main.sources= # sources (class name, package name or XML resource location) to include
 	spring.main.web-environment= # detect by default
 	spring.main.show-banner=true
-	spring.main.banner-mode=console # the mode used to display the banner (console, off, or log)
+	spring.main.banner-mode=console # mode used to display the banner when the application runs (console, off, or log)
 	spring.main....= # see class for all properties
 
 	# AUTO-CONFIGURATION

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

@@ -109,12 +109,21 @@
     "sourceType": "org.springframework.boot.context.config.ConfigFileEnvironmentPostProcessor",
     "description": "Config file locations."
   },
+  {
+    "name": "spring.main.banner-mode",
+    "type": "org.springframework.boot.Banner$Mode",
+    "sourceType": "org.springframework.boot.SpringApplication",
+    "description": "Mode used to display the banner when the application runs.",
+    "defaultValue": "console",
+  },
   {
     "name": "spring.main.show-banner",
     "type": "java.lang.Boolean",
     "sourceType": "org.springframework.boot.SpringApplication",
     "description": "Display the banner when the application runs.",
-    "defaultValue": true
+    "defaultValue": true,
+    "deprecated": true,
+    "deprecation": {"replacement": "spring.main.banner-mode"}
   },
   {
     "name": "spring.main.sources",