Update apps.adoc (#467)

Improve grammar in "important" callout.

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*Description of changes:*


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Author: kazuo459

v2/guide/apps.adoc

@@ -105,7 +105,7 @@ Passing the scope explicitly allows each construct to add itself to the tree, wi
 [IMPORTANT]
 ====
 
-Technically, it's possible to pass some scope other than `this` when instantiating a construct. You can add constructs anywhere in the tree, or even in another stack in the same app. For example, you could write a mixin-style function that adds constructs to a scope passed in as an argument. The practical difficulty here is that you can't easily ensure that the IDs you choose for your constructs are unique within someone else's scope. The practice also makes your code more difficult to understand, maintain, and reuse. Therefore, we recommend that you use the general structure of the construct tree.
+Technically, it's possible to pass some scope other than `this` when instantiating a construct. You can add constructs anywhere in the tree, or even in another stack in the same app. For example, you could write a mixin-style function that adds constructs to a scope passed in as an argument. The practical difficulty here is that you can't easily ensure that the IDs you choose for your constructs are unique within someone else's scope. This practice also makes your code more difficult to understand, maintain, and reuse. Therefore, we recommend that you use the general structure of the construct tree.
 
 ====
 
@@ -125,4 +125,4 @@ The construct tree defines an implicit order in which constructs are synthesized
 
 You can also add an explicit dependency between two nodes by using `node.addDependency()`. For more information, see https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib-readme.html#dependencies[Dependencies] in the _{aws} CDK API Reference_.
 
-The {aws} CDK provides a simple way to visit every node in the construct tree and perform an operation on each one. For more information, see xref:aspects[Aspects and the {aws} CDK].
+The {aws} CDK provides a simple way to visit every node in the construct tree and perform an operation on each one. For more information, see xref:aspects[Aspects and the {aws} CDK].