docs: fixed documentatio - batchSize to batch_size

Minor inconsistency in options for the `WriteOptions`, switched from `camelCase` to `snake_case`.

Author: baweaver

README.md

@@ -214,7 +214,7 @@ The writes are processed in batches which are configurable by `WriteOptions`:
 
 | Property                 | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Default Value |
 |--------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|
-| batchSize                | the number of data point to collect in batch                                                                                                                                                                                                                                                                                                                                                                                                                                         | 1_000         |
+| batch_size                | the number of data point to collect in batch                                                                                                                                                                                                                                                                                                                                                                                                                                         | 1_000         |
 | flush_interval           | the number of milliseconds before the batch is written                                                                                                                                                                                                                                                                                                                                                                                                                               | 1_000         |
 | retry_interval           | the number of milliseconds to retry unsuccessful write. The retry interval is used when the InfluxDB server does not specify "Retry-After" header.                                                                                                                                                                                                                                                                                                                                   | 5_000         |
 | jitter_interval          | the number of milliseconds to increase the batch flush interval by a random amount                                                                                                                                                                                                                                                                                                                                                                                                   | 0             |