Fix JMX exposure default in config metadata and docs

Fixes gh-33072

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

@@ -66,7 +66,7 @@
     },
     {
       "name": "management.endpoints.jmx.exposure.include",
-      "defaultValue": "*"
+      "defaultValue": "health"
     },
     {
       "name": "management.endpoints.jmx.unique-names",

spring-boot-project/spring-boot-docs/src/docs/asciidoc/actuator/endpoints.adoc

@@ -159,7 +159,7 @@ To change which endpoints are exposed, use the following technology-specific `in
 |
 
 | configprop:management.endpoints.jmx.exposure.include[]
-| `*`
+| `health`
 
 | configprop:management.endpoints.web.exposure.exclude[]
 |