Nitpicks for Ch. 10 (#401)

Author: ianjmacintosh

exercises/10.arrays/01.solution.key-prop/README.mdx

@@ -2,10 +2,10 @@
 
 <EpicVideo url="https://www.epicreact.dev/workshops/react-fundamentals/key-prop/solution" />
 
-👨‍💼 Great work. That was super weird an confusing for our users. They're much
+👨‍💼 Great work. That was super weird and confusing for our users. They're much
 happier now.
 
-🦉 Note, the key only needs to be unique within a given array. So this works
+🦉 The key only needs to be unique within a given array. So this works
 fine:
 
 ```tsx

exercises/10.arrays/README.mdx

@@ -45,7 +45,7 @@ So we're interpolating an array of renderable elements. This is totally
 acceptable, but it has interesting implications for when things change over
 time.
 
-We haven't covered things changing over time yet, but this warning's going to
+We haven't covered things changing over time yet, but a warning's going to
 show up any time you render an array regardless of whether that array changes
 so we're going to address that here.