docs(cosmetic): wordsmith AIP 4235.md (#1324)

* docs(cosmetic): wordsmith AIP 4235.md

* Consistent wording

Author: vchudnov-g

aip/client-libraries/4235.md

@@ -7,17 +7,17 @@ created: 2024-03-07
 # Automatically populate fields in the request message
 
 For APIs that leverage request idempotency as described via [AIP-155], APIs may
-choose to have the client libraries automatically populate the `request_id`
-if it is not already set by the customer.
+choose to have the client libraries automatically populate fields such as 
+`request_id` if they are not already set by the customer.
 
 **Note:** This feature is primarily written for `request_id` fields within the
 request message. Nonetheless, this feature **must** work for a field of any
-name, as long as the below conditions hold true.
+name, as long as the conditions below hold true.
 
 ## Guidance
 
 APIs **may** configure fields in the request message for automatic population.
-For a field to be automatically populated, **all** the below configurations
+For a field to be automatically populated, **all** the conditions below
 **must** be true:
 
 - The field **must** be of type `string`
@@ -37,19 +37,20 @@ For a field to be automatically populated, **all** the below configurations
 If the aforementioned requirements are met for a given field, client library
 generators **must** enable automatic population of said field in the
 generated client.
+
 If a field is specified in the `auto_populated_fields`, but does not meet the
 structural requirements, the client library generators **must not** enable
 automatic population for that field. Client library generators **may** emit an
 error during generation.
 
 Client libraries **must** reuse automatically populated values for retries of
-the same request i.e., the automatically populated fields **must not** be
-regenerated for each RPC attempt with a single request message.
+the same request. In other words, the automatically populated fields **must not**
+be regenerated for each RPC attempt with the same request message.
 
 [AIP-155]: https://google.aip.dev/155
 
 [apf]: https://github.com/googleapis/googleapis/blob/master/google/api/client.proto
 
 [uuid4]: https://google.aip.dev/202#uuid4
 
-[required]: https://google.aip.dev/203#required
+[required]: https://google.aip.dev/203#required