docs: specify Unix timestamp in seconds for contact write paths (#525)

Author: adisan19

fern/openapi-overrides.yml

@@ -1254,15 +1254,15 @@ components:
               type: integer
               format: date-time
               nullable: true
-              description: The time specified for when a contact signed up
+              description: The time specified for when a contact signed up (Unix timestamp in seconds)
               example: 1571672154
             last_seen_at:
               type: integer
               format: date-time
               nullable: true
               description:
-                The time when the contact was last seen (either where the Intercom
-                Messenger was installed or when specified manually)
+                The time when the contact was last seen (Unix timestamp in seconds),
+                either where the Intercom Messenger was installed or when specified manually
               example: 1571672154
             owner_id:
               type: integer
@@ -1307,15 +1307,15 @@ components:
               type: integer
               format: date-time
               nullable: true
-              description: The time specified for when a contact signed up
+              description: The time specified for when a contact signed up (Unix timestamp in seconds)
               example: 1571672154
             last_seen_at:
               type: integer
               format: date-time
               nullable: true
               description:
-                The time when the contact was last seen (either where the Intercom
-                Messenger was installed or when specified manually)
+                The time when the contact was last seen (Unix timestamp in seconds),
+                either where the Intercom Messenger was installed or when specified manually
               example: 1571672154
             owner_id:
               type: integer
@@ -1360,15 +1360,15 @@ components:
               type: integer
               format: date-time
               nullable: true
-              description: The time specified for when a contact signed up
+              description: The time specified for when a contact signed up (Unix timestamp in seconds)
               example: 1571672154
             last_seen_at:
               type: integer
               format: date-time
               nullable: true
               description:
-                The time when the contact was last seen (either where the Intercom
-                Messenger was installed or when specified manually)
+                The time when the contact was last seen (Unix timestamp in seconds),
+                either where the Intercom Messenger was installed or when specified manually
               example: 1571672154
             owner_id:
               type: integer