fixed broken docs hyperlink

doc/making_calls.md

@@ -169,7 +169,7 @@ You can use these errors to help understand your SQL. If you encounter errors ex
 
 ## Write data to your CARTO account
 
-Performing inserts or updates on your data is simple using your [API Key](#authentication). All you need to do is supply a correct SQL [INSERT](http://www.postgresql.org/docs/9.1/static/sql-insert.html) or [UPDATE](http://www.postgresql.org/docs/9.1/static/sql-update.html) statement for your table along with the api_key parameter for your account. Be sure to keep these requests private, as anyone with your API Key will be able to modify your tables. A correct SQL insert statement means that all the columns you want to insert into already exist in your table, and all the values for those columns are the right type (quoted string, unquoted string for geoms and dates, or numbers).
+Performing inserts or updates on your data is simple using your [API Key](https://carto.com/docs/carto-engine/sql-api/authentication/). All you need to do is supply a correct SQL [INSERT](http://www.postgresql.org/docs/9.1/static/sql-insert.html) or [UPDATE](http://www.postgresql.org/docs/9.1/static/sql-update.html) statement for your table along with the api_key parameter for your account. Be sure to keep these requests private, as anyone with your API Key will be able to modify your tables. A correct SQL insert statement means that all the columns you want to insert into already exist in your table, and all the values for those columns are the right type (quoted string, unquoted string for geoms and dates, or numbers).
 
 ### Insert