Update Practice_2.3_Data_wrangling_multiple_datasets.md

Author: bioinfo-arctic

Spring_2026/Practice_2.3_Data_wrangling_multiple_datasets.md

@@ -96,7 +96,7 @@ summary_tuna
 ```
 Finally, we have two datasets with a valid unique key (Country_code and flag_gfw)
 We are going to left-join the table of fishing efforts to the table of tuna catches  
-See more information on types of join in the book [R for Data Science](https://r4ds.hadley.nz/joins.html#sec-mutating-joins)
+See more information on types of join in the book [R for Data Science](https://r4ds.hadley.nz/joins.html#how-do-joins-work)
 ```
 merged_table <- left_join(summary_tuna,summary_vessels, by = c("Country_code" = "flag_gfw"))
 merged_table