Merge pull request #3969 from alianheart/patch-1

Update joining-tables.md

Author: Blargian

docs/guides/joining-tables.md

@@ -88,7 +88,7 @@ WHERE has(arrayFilter(t -> (t != ''), splitByChar('|', p.Tags)), 'java') AND (p.
 1 row in set. Elapsed: 1.519 sec. Processed 252.30 million rows, 1.62 GB (166.06 million rows/s., 1.07 GB/s.)
 ```
 
-Adding a filter to the right side table improves performance even further to 0.5s.
+Adding a filter to the left side table improves performance even further to 0.5s.
 
 ```sql
 SELECT countIf(VoteTypeId = 2) AS upvotes