Document default value for show-value configuration properties

See gh-39589

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

@@ -30,6 +30,14 @@
       "description": "Whether to enable default metrics exporters.",
       "defaultValue": true
     },
+    {
+      "name": "management.endpoint.configprops.show-values",
+      "defaultValue": "never"
+    },
+    {
+      "name": "management.endpoint.env.show-values",
+      "defaultValue": "never"
+    },
     {
       "name": "management.endpoint.health.probes.add-additional-paths",
       "type": "java.lang.Boolean",
@@ -95,6 +103,10 @@
         "health"
       ]
     },
+    {
+      "name": "management.endpoint.quartz.show-values",
+      "defaultValue": "never"
+    },
     {
       "name": "management.ganglia.metrics.export.addressing-mode",
       "defaultValue": "multicast"