chore: note that client provided ids are query params for REST (#944)

chore: note that client provided ids are query params for REST

Author: shwoodard

aip/general/0133.md

@@ -178,6 +178,9 @@ message CreateBookRequest {
     duplicate resource, the service **must** error with `PERMISSION_DENIED`
     instead.
 
+**Note:** For REST APIs, the user-specified ID field, `{resource}_id`,
+is provided as a query parameters on the request URI.
+
 **Important:** Declarative-friendly resources (AIP-128) **must** support
 user-specified IDs.