Update demos/market-data-enrichment.mdx

Co-authored-by: Richard Chien <[email protected]>
Signed-off-by: emile-00 <[email protected]>

demos/market-data-enrichment.mdx

@@ -106,7 +106,7 @@ SELECT * FROM avg_price_bid_ask_spread LIMIT 5;
 
 ### Calculate rolling price volatility
 
-The `rolling_volatility` materialized view uses the `stddev_samp` function to calculate the rolling price volatility within five-minute time windows by using `TUMBLE()` and grouping by the `assed_id` and the time window..  
+The `rolling_volatility` materialized view uses the `stddev_samp` function to calculate the rolling price volatility within five-minute time windows by using `TUMBLE()` and grouping by the `assed_id` and the time window.
 
 ```sql
 CREATE MATERIALIZED VIEW rolling_volatility2 AS