Update demos/marketing-analysis.mdx

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

demos/marketing-analysis.mdx

@@ -152,7 +152,7 @@ SELECT * FROM campaign_performance LIMIT 5;
 
 The `channel_attribution` materialized view analyzes the marketing performance over 1-hour time windows. Again, the `tumble` function is used to map each event into a 1-hour time window. Then, you group by the time window and channel type to find the aggregate channel metrics.
 
-This materialized views helps to show the effectiveness of each marketing channel in driving conversion and revenue. It provides details such as the number of unique, engaged users, and the total revenue generated by each channel.
+This materialized view helps to show the effectiveness of each marketing channel in driving conversion and revenue. It provides details such as the number of unique, engaged users, and the total revenue generated by each channel.
 
 ```sql
 CREATE MATERIALIZED VIEW channel_attribution AS