Update parquet-mode.md (#6943)

k logs cortex-parquet-converter-0
error loading config from /etc/cortex/cortex.yaml: Error parsing config file: yaml: unmarshal errors:
  line 59: cannot unmarshal !!str `100MB` into int
  line 60: cannot unmarshal !!str `1GB` into int

Signed-off-by: Charlie Le <[email protected]>

Author: CharlieTLe

docs/guides/parquet-mode.md

@@ -148,10 +148,10 @@ limits:
   parquet_max_fetched_row_count: 1000000
 
   # Maximum chunk bytes per query
-  parquet_max_fetched_chunk_bytes: 100MB
+  parquet_max_fetched_chunk_bytes: 100_000_000 # 100MB
 
   # Maximum data bytes per query
-  parquet_max_fetched_data_bytes: 1GB
+  parquet_max_fetched_data_bytes: 1_000_000_000 # 1GB
 ```
 
 ### Cache Configuration