Fix(AIP-233): Change the recommendation to allow returning partial (#1071)

successes.

Author: hrasadi

aip/general/0233.md

@@ -39,10 +39,12 @@ rpc BatchCreateBooks(BatchCreateBooksRequest) returns (BatchCreateBooksResponse)
   the collection used for simple CRUD operations. If the operation spans
   parents, a dash (`-`) **may** be accepted as a wildcard.
 - The body clause in the `google.api.http` annotation **should** be `"*"`.
-- The operation **must** be atomic: it **must** fail for all resources or
+- The operation **should** be atomic: it **should** fail for all resources or
   succeed for all resources (no partial success).
   - If the operation covers multiple locations and at least one location is
     down, the operation **must** fail.
+  - In cases where supporting partial responses cannot be avoided, the design
+    should follow the guidelines of [AIP-193](https://aip.dev/193).
 
 ### Request message
 
@@ -114,7 +116,9 @@ message BatchCreateBooksResponse {
 
 ## Changelog
 
-- **2022-06-02:** Changed suffix descriptions to eliminate superfluous "-".
+- **2023-04-18**: Changed the recommendation to allow returning partial 
+  successes.
+- **2022-06-02**: Changed suffix descriptions to eliminate superfluous "-".
 - **2020-09-16**: Suggested annotating `parent` and `requests` fields.
 - **2020-08-27**: Removed parent recommendations for top-level resources.
 - **2019-08-01**: Changed the examples from "shelves" to "publishers", to