Use product name instead of package name (#1921)

* vue-test-utils -> Vue Test Utils

Author: oohira

Diff for: src/v2/guide/unit-testing.md

@@ -4,7 +4,7 @@ type: guide
 order: 402
 ---
 
-> [Vue CLI](https://cli.vuejs.org/) has built-in options for unit testing with [Jest](https://github.com/facebook/jest) or [Mocha](https://mochajs.org/) that works out of the box. We also have the official [vue-test-utils](https://vue-test-utils.vuejs.org/) which provides more detailed guidance for custom setups.
+> [Vue CLI](https://cli.vuejs.org/) has built-in options for unit testing with [Jest](https://github.com/facebook/jest) or [Mocha](https://mochajs.org/) that works out of the box. We also have the official [Vue Test Utils](https://vue-test-utils.vuejs.org/) which provides more detailed guidance for custom setups.
 
 ## Simple Assertions