Update configuration-reference.md (#37745)

sdk/cosmos/azure-cosmos-spark_3_2-12/docs/configuration-reference.md

@@ -83,8 +83,8 @@ Used to influence the json serialization/deserialization behavior
 | :---                                            |:----------------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| 
 | `spark.cosmos.changeFeed.startFrom`               | `Beginning`                 | ChangeFeed Start from settings (`Now`, `Beginning`  or a certain point in time (UTC) for example `2020-02-10T14:15:03`) - the default value is `Beginning`. If the write config contains a `checkpointLocation` and any checkpoints exist, the stream is always continued independent of the `spark.cosmos.changeFeed.startFrom` settings - you need to change `checkpointLocation` or delete checkpoints to restart the stream if that is the intention.                              | 
 | `spark.cosmos.changeFeed.mode`                    | `Incremental/LatestVersion` | ChangeFeed mode (`Incremental/LatestVersion` or `FullFidelity/AllVersionsAndDeletes`) - NOTE: `FullFidelity/AllVersionsAndDeletes` is in experimental state right now. It requires that the subscription/account has been enabled for the private preview and there are known breaking changes that will happen for `FullFidelity/AllVersionsAndDeletes` (schema of the returned documents). It is recommended to only use `FullFidelity/AllVersionsAndDeletes` for non-production scenarios at this point. | 
-| `spark.cosmos.changeFeed.itemCountPerTriggerHint` | None                        | Approximate maximum number of items read from change feed for each micro-batch/trigger                                                                                                                                                                                                                                                                                                                                                                                                 |
-| `spark.cosmos.changeFeed.batchCheckpointLocation` | None                        | Can be used to generate checkpoints when using change feed queries in batch mode - and proceeding on the next iteration where the previous left off.                                                                                                                                                                                                                                                                                                                                   |
+| `spark.cosmos.changeFeed.itemCountPerTriggerHint` | None (process all available data in first micro-batch) | Approximate maximum number of items read from change feed for each micro-batch/trigger. If not set, all available data in the changefeed is going to be processed in the first micro-batch. This could overload the client-resources (especially memory), so choosing a value to cap the resource consumption in the Spark executors is advisable here. Usually a reasonable value would be at least in the 100-thousands or single-digit millions.       |
+| `spark.cosmos.changeFeed.batchCheckpointLocation` | None                        | Can be used to generate checkpoints when using change feed queries in batch mode - and proceeding on the next iteration where the previous left off.           |
 
 #### Json conversion configuration
 | Config Property Name      | Default | Description |