Update 05-aggregating-calculating.md

Author: jyssy

_episodes/05-aggregating-calculating.md

@@ -96,7 +96,7 @@ ORDER BY Author_Count -1 DESC;
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 {: .sql}
 
-In section [6. Joins and aliases](https://librarycarpentry.org/lc-sql/06-joins-aliases/index.html) we are going to learn more about the SQL keyword  `AS`  and how make use of aliases.
+In section [6. Joins and aliases](https://librarycarpentry.org/lc-sql/06-joins-aliases/index.html) we are going to learn more about the SQL keyword `AS` and how to make use of aliases.
 
 We can use any arithmetic operators (like `+`, `-`, `*`, `/`, square root `SQLRT` or the modulo operator `%`) if we would like.