improve docs

Author: khvn26

src/main/java/com/flagsmith/flagengine/IdentityContext.java

@@ -1,3 +1,12 @@
+/*
+ * IdentityContext
+ *
+ * <p>This class was auto-generated by jsonschema2pojo.org
+ * and is referenced in the Evaluation Context schema as
+ * `"existingJavaType": "com.flagsmith.flagengine.IdentityContext"`
+ * to work around jsonschema2pojo's lack of `anyOf` support.
+ */
+
 package com.flagsmith.flagengine;
 
 import com.fasterxml.jackson.annotation.JsonAnyGetter;