Merge pull request #48 from Meg528/patch-31

Update 3-structure-aggregation.mdx

Author: dfreniche

docs/20-what-is-aggregation/3-structure-aggregation.mdx

@@ -4,7 +4,7 @@ description: See the parts that compose an aggregation pipeline.
 
 # 📘 Structure of an Aggregation Pipeline
 
-To interact with a relational database, we typically use SQL, a 4th-generation language, to access our data. With MongoDB, we instead get data and transform it in incremental steps.
+To interact with a relational database, we typically use SQL, a fourth-generation language, to access our data. With MongoDB, we instead get data and transform it in incremental steps.
 
 An aggregation pipeline is composed of [__stages__](https://www.mongodb.com/docs/manual/reference/operator/aggregation-pipeline/).