Document correct replacement for spring.jackson.generator

See gh-48255

Signed-off-by: michaldo <michaldo@github.com>

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

@@ -12,7 +12,7 @@
       "name": "spring.jackson.generator",
       "deprecation": {
         "level": "error",
-        "reason": "Partially replaced by 'spring.jackson.json.read'.",
+        "reason": "Partially replaced by 'spring.jackson.json.write'.",
         "since": "4.0.0"
       }
     },