cleared up sentence

Author: senritsu

content/how-to/author-libraries.md

@@ -173,7 +173,7 @@ module.exports = {
 };
 ```
 
-If `library` property is set and `libraryTarget` is set to be `var` by default, as given in the [config reference](/configuration/output).
+If `library` is set and `libraryTarget` is not, `libraryTarget` defaults to `var` as specified in the [config reference](/configuration/output).
 
 ### Final Steps
 
@@ -192,4 +192,4 @@ __package.json__
 }
 ```
 
-Now you can [publish it as an npm package](https://docs.npmjs.com/getting-started/publishing-npm-packages) and find it at [unpkg.com](https://unpkg.com/#/) to distribute it to your users.
+Now you can [publish it as an npm package](https://docs.npmjs.com/getting-started/publishing-npm-packages) and find it at [unpkg.com](https://unpkg.com/#/) to distribute it to your users.