chore: update default value docs for FLUSH_AT and FLUSH_INTERVAL (#1306)

update default value docs for `FLUSH_AT` and `FLUSH_INTERVAL`

Signed-off-by: qnnn <[email protected]>

Author: qnnn

langfuse/_client/environment_variables.py

@@ -76,15 +76,15 @@
 .. envvar:: LANGFUSE_FLUSH_AT
 
 Max batch size until a new ingestion batch is sent to the API.
-**Default value:** ``15``
+**Default value:** same as OTEL ``OTEL_BSP_MAX_EXPORT_BATCH_SIZE``
 """
 
 LANGFUSE_FLUSH_INTERVAL = "LANGFUSE_FLUSH_INTERVAL"
 """
 .. envvar:: LANGFUSE_FLUSH_INTERVAL
 
 Max delay in seconds until a new ingestion batch is sent to the API.
-**Default value:** ``1``
+**Default value:** same as OTEL ``OTEL_BSP_SCHEDULE_DELAY``
 """
 
 LANGFUSE_SAMPLE_RATE = "LANGFUSE_SAMPLE_RATE"