docs: mark BusinessInfo.phone as output only

PiperOrigin-RevId: 640445179

Author: Google APIs

google/shopping/merchant/accounts/v1beta/businessinfo.proto

@@ -72,9 +72,9 @@ message BusinessInfo {
   optional google.type.PostalAddress address = 2
       [(google.api.field_behavior) = OPTIONAL];
 
-  // Optional. The phone number of the business.
+  // Output only. The phone number of the business.
   optional google.type.PhoneNumber phone = 3
-      [(google.api.field_behavior) = OPTIONAL];
+      [(google.api.field_behavior) = OUTPUT_ONLY];
 
   // Output only. The phone verification state of the business.
   optional PhoneVerificationState phone_verification_state = 4