Doc max message length

Author: aliu39

develop-docs/sdk/data-model/envelope-items.mdx

@@ -210,7 +210,8 @@ for this item type. For other attributes, see [Event Payloads](/sdk/data-model/e
 
 `message`
 
-: **String, required.** Comments of the user, describing what happened and/or sharing feedback.
+: **String, required.** Comments of the user, describing what happened and/or sharing
+feedback. The max length is **4096 characters**.
 
 `contact_email`
 
@@ -286,7 +287,7 @@ an error.
 
 `comments`
 
-: *String, recommended.* Comments of the user about what happened.
+: *String, recommended.* Comments of the user about what happened. The max length is **4096 characters**.
 
 **Constraints:**