Merge pull request #55 from Meg528/patch-40

Update 5-combining-them-all.mdx

Author: dfreniche

docs/30-simple-queries/5-combining-them-all.mdx

@@ -1,7 +1,7 @@
 import Tabs from '@theme/Tabs';
 import TabItem from '@theme/TabItem';
 
-# 👐 Combining stages
+# 👐 Combining Stages
 
 Up until now, we've just been using one stage in the pipeline. But the power of the aggregation pipeline is that we can use many stages, and the output of one will be the input of the next. Think of it as UNIX pipes or using functional programming with `map`, `filter`, `reduce`, `flatmap`, etc.