docs: fix typos [ci skip]

Author: haoqunjiang

CHANGELOG.md

@@ -1,12 +1,12 @@
 
 ## 4.0.0-rc.4 (2019-09-25)
 
-Start from the version, the `unit-jest` plugin now comes with four configuration presets:
+Start from the version, the `unit-jest` plugin comes with 4 configuration presets:
 
 - `@vue/cli-plugin-unit-jest` The default preset for the most common type of projects
 - `@vue/cli-plugin-unit-jest/presets/no-babel` If you don't have `@vue/cli-plugin-babel` installed and don't want to see babel files in the project
 - `@vue/cli-plugin-unit-jest/presets/typescript` The preset with TypeScript support (but no TSX support)
-- `@vue/cli-plugin-unit-jest/presets/typescript-and-babel` The preset with TypeScript (and TSX) and babel suuport.
+- `@vue/cli-plugin-unit-jest/presets/typescript-and-babel` The preset with TypeScript (and TSX) and babel support.
 
 If you haven't changed the default Jest configurations (lies in either `jest.config.js` or the `jest` field in `package.json`) ever since project creation, you can now replace the massive configuration object with one single field:
 
@@ -19,7 +19,7 @@ module.exports = {
 
 A reminder:
 The default test environment in the new presets is jsdom@15, which differs from the default one in Jest 24 (jsdom@11).
-This is to be align with the upcoming Jest 25 changes.
+This is to be aligned with the upcoming Jest 25 updates.
 Most users won't be affected by this change.
 For a detailed changelog with regard to jsdom, see https://github.com/jsdom/jsdom/blob/master/Changelog.md