Update 1-what-is-aggregation.mdx

Author: Meg528

docs/20-what-is-aggregation/1-what-is-aggregation.mdx

@@ -1,18 +1,17 @@
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-description: Learn what is an Aggregation Pipeline 
+description: Learn what an aggregation pipeline is. 
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-# 📘 What is an Aggregation Pipeline
+# 📘 What is an Aggregation Pipeline?
 
 ![](/img/20-what-is-aggregation/aggregation-pipeline.png)
 
-An Aggregation Pipeline is similar to unix commands connected using pipes. 
-We can Construct modular, composable processing pipelines.
+An aggregation pipeline is similar to unix commands connected using pipes. We can construct modular, composable processing pipelines.
 
-An aggregation pipeline consists of one or more _stages_ that processes documents:
+An aggregation pipeline consists of one or more _stages_ that process documents:
 
 Each stage performs an operation on the input documents. For example, a stage can filter documents, group documents, and calculate values.
 
 The documents that are the output of a stage are passed as the input to the next stage.
 
-An aggregation pipeline can return results for groups of documents. For example, return the total, average, maximum, and minimum values, etc.
+An aggregation pipeline can return results for groups of documents. For example, return the total, average, maximum, and minimum values, etc.