chore(docs): Sync latest document.yml spec. (#531)

Author: eyw520

fern/apis/fai/definition/document.yml

@@ -35,6 +35,9 @@ service:
             version:
               type: optional<string>
               docs: The version of the document
+            product:
+              type: optional<string>
+              docs: The product of the document
             keywords:
               type: optional<list<string>>
               docs: The keywords of the document
@@ -74,6 +77,9 @@ service:
             version:
               type: optional<string>
               docs: The version of the document
+            product:
+              type: optional<string>
+              docs: The product of the document
             keywords:
               type: optional<list<string>>
               docs: The keywords of the document
@@ -146,6 +152,7 @@ types:
       title: optional<string>
       url: optional<string>
       version: optional<string>
+      product: optional<string>
       keywords: optional<list<string>>
       authed: optional<boolean>
       created_at: datetime